The safe, secure and completely free way to transfer large files around the Web.

What is ZendTo?

It is a classic problem: you need to send files to someone, or they need to send them to you, and there's no way except email. But they are too large or your administrator won't let you transfer the files by email at all. ZendTo to the rescue!

Why ZendTo?

ZendTo is a completely free web-based system, which you can run on your own server with complete safety and security. It runs from any Linux / Unix server or virtualisation system, there is no size limit and it will send files 50% faster than by email.

Key Features

• Secure encryption & decryption of uploaded files, using a user-selected passphrase, to protect personal or restricted data
• Checksums of uploaded files, to avoid disputes over exactly what content was delivered
• Single-use download links
• Users are informed of the use and processing of their data, in line with GDPR requirements
• Very simple to use, supports drag-and-drop file selection
• Easy to translate into other languages (14 provided), and customise for your organisation
• Large files are uploaded in small chunks, to work around network security device limits
• Integrates with any existing Active Directory, OAuth, SAML-based, LDAP or IMAP authentication service
• No hard upload limits (50GB uploads are normal)
• Automated installer provided for quick installation on any minimal server install of Rocky, RedHat, Ubuntu, Debian, CentOS, SUSE, OpenSUSE or FreeBSD
• Docker support for very fast deployment
• Scriptable and can be driven via a simple API
• Integrates with existing customer service ticketing systems

Technical support is provided by email or an active mailing list. All completely free.

News

• 04/09/2023 - Released beta version 6.14-2 with updated dependencies, and new beta of SimpleSAMLphp for ZendTo 1.2-1 with an updated version of SimpleSAMLphp in it. Please see the beta page for more info and download links. Also the ChangeLog.
• 07/12/2022 - Released production version 6.13-3 to fix problem where people using the legacy mail sending (those not setting 'SMTPserver') could get wrapped headers on some versions of PHP.
• 01/11/2022 - Released production version 6.13-2 to fix a problem where the "Download All Files as a Zip" button was broken on systems running PHP 7. Thanks to Cory Musil for the fix!
• 28/10/2022 - New Production release: Version 6.13-1. All libraries and dependencies upgraded to their latest versions, Docker support, Installer improved, plus various bug fixes. Please see the Change Log for more details and the downloads page to get it.
• 26/10/2022 - ZendTo Installer updated to support RedHat 9, Rocky 9 and Ubuntu 22.
• 25/10/2022 - Released beta version 6.12-12 to update all dependencies and libraries to latest available versions.
• 16/06/2022 - Released beta version 6.12-10 which fixes a Docker permissions error.
• 14/06/2022 - Released beta version 6.12-9 which includes Smarty 4.1 which properly supports PHP 8.1.
• 09/06/2022 - Docker support is now documented here. Please do try it out!
• 06/06/2022 - Docker support! Finally. Included in the distribution is a docker-compose.yml which you can use to build a single container service ZendTo on port 80 with shared storage. Add your own nginx to add https on the front. New beta release 6.12-7 available from the beta page. ZendTo itself is stable, I don't guarantee the Docker support to be perfect yet. Please let me know if you try it.
• 04/04/2022 - New beta release 6.12-1 available from the beta page. I've updated all ZendTo dependencies to the latest versions (including the zendto-saml package) and got it all working on PHP 8.0 and 8.1. Also I have updated the Installer to support Rocky Linux, and Ubuntu 21. Sorry it's been so long for this update to arrive, life has been busy. Please do test this, and the updated Installer, and let me know what you think.
• 28/06/2021 - New Production release 6.11-2. This is an important security release as it fixes a vulnerability in the naming of uploaded files done using a specially crafted HTTP POST request. "Requests for Drop-offs" are shown in a user's Inbox, and there have been various logging improvements and other bug fixes. For more details, please see the Change Log.
• 18/06/2021 - New beta release 6.10-10 available from the beta page. The same error improvements are now also applied to new drop-offs. Requests shown in a user's Inbox and the global list of all drop-offs (highlighted in yellow) are now sorted correctly by their creation date, not their start date.
• 11/06/2021 - New beta release 6.10-9 available from the beta page. This significantly improves the handling of errors in requests sent to multiple recipients.
• 04/06/2021 - New beta release 6.10-8 available from the beta page. This should finally fix the timezone problems with requests for drop-offs, where users west of the server could receive a request email that they couldn't use yet.
• 24/05/2021 - New beta release 6.10-6 available from the beta page. Added new "check_templates" tool which is run by the upgrade script, to verify your template files are up to date. Also a big security fix in the handling of uploaded filenames.
• 07/05/2021 - Installer fixed to avoid the "I am not a robot" problem.
• 23/04/2021 - Google "I am not a robot" not appearing? Here is how to fix it!
• 26/03/2021 - New beta release 6.10-4 available from the beta page. The AD authenticator can now read results from the AD server that are split over multiple pages. Please also note the new settings that "upgrade" will show you! If you use 'authLDAPMemberRole' to restrict logins by group, you will need to setup the new AD-specific versions of this setting.
• 14/03/2021 - New production release 6.09-1. The biggest new feature this time is "single-use links", where you can make a drop-off whose files can each only be downloaded once. If the recipient needs another attempt, the sender just clicks the "Resend Dropoff" button via their Outbox. For more details, please see the Change Log.
• 08/03/2021 - Screenshots updated to reflect latest new features.
• 08/03/2021 - Another new beta release 6.08-15 is now available from the beta page. Emailed links no longer include any email addresses, improving data privacy without affecting functionality. Hopefully now getting (very?) close to a production release.
• 04/03/2021 - Another new beta release 6.08-13 is now available from the beta page. Lots of bugs fixed. Hopefully now getting close to a production release.
• 03/03/2021 - New beta release 6.08-11 is now available from the beta page. Valid unused "requests" are now shown in your "Inbox" page, and the admin's Global List page, giving you the ability to see their info, and delete or resend each one.
• 26/02/2021 - New beta release 6.08-8 is now available from the beta page. If you are using the 'AD' authenticator, your Inbox will now show all drop-offs addressed to any of your "proxyAddresses", as well as those to your main email address.
• 25/02/2021 - New beta release 6.08-7 is now available from the beta page. In the "new drop-off" form you can now specify a precise expiry time for the drop-off using a date/time picker, as well as just being able to set the number of days until expiry. You can disable the expiry changer from appearing, in your preferences.php file.
• 22/02/2021 - New beta release 6.08-5 now available from the beta page. The main new feature is the introduction of "one-time links" so that senders can restrict the recipient to only being able to download each file once. The status of the files in the drop-off can easily be reset by the sender clicking the "Resend Dropoff" button in their ZendTo Outbox.
• 02/02/2021 - New Production release 6.07-1. This includes all the bug-fixes from the 6.06 beta releases.
• 10/12/2020 - New beta release 6.06-3. Some minor bug fixes, plus a fix where requests would get the wrong start+expiry times if requested from a different timezone from the server. Also changed the behaviour of RPM upgrades to make systems simply work after upgrading, when any of the *.tpl user-interface template files had been changed locally.
• 04/11/2020 - New beta release 6.06-2. 2 minor bug fixes, as listed at the top of the beta page. As soon as I hear confirmation that this release works, I will do a full "production" release. So the more of you test it for me, the faster you can get those pesky bugs fixed on your production systems.
• 28/09/2020 - New beta release 6.06-1. The "autorequest" automation script should now work correctly again, and offer all the available options it can. Also I have extended the length of database fields that contained organization names to 255 characters, instead of 32. As usual, your DB schema should automatically update itself on installation.
• 31/08/2020 - New Production release 6.05-4. The main improvements are to the "request a drop-off" page, which I have overhauled. You can now specify an opening and closing time and date for the resulting drop-off. So if people try to submit too late or too early, they can't. Also a bunch of minor improvements and bug-fixes. The Change Log will tell you more.
• 13/08/2020 - Another new beta release 6.04-2. A few logging improvements and logging bug fixes that have been requested, and more detailed logging about users creating new drop-offs. The Change Log should tell you more.
• 22/07/2020 - New beta release 6.04-1. I have overhauled the "request a drop-off" page and added date/time pickers to it to set precise start and end times when the request is valid.
• 15/07/2020 - Bug-fix Production release 6.03-5. All known bugs fixed, including one that could cause users to be reminded about the wrong near-expiry drop-offs. Also updated translations. See the Change Log for details.
• 10/07/2020 - Bug-fix Production release 6.03-4. Fixed reported bugs in the chunk upload error handling code.
• 05/07/2020 - New Production release 6.03-3. New Turkish translation, some bug-fixes and speed optimisation to template library.
• 30/06/2020 - New Production release 6.03-1. New features include editable Subject lines, Inbox/Outbox "Export as CSV" buttons and others; and also some bug-fixes.
• 29/06/2020 - Released a new bug-fix beta 6.02-5. This fixes a bug where totally incorrect expiry times were shown in reminder emails. Thanks to Susoczki Attila for reporting this. Download instructions are on the beta page.
• 25/06/2020 - Released a new beta 6.02-4. Exporting as CSV will now only export the visible columns, and you can make all the columns visible with 1 click. This is very close to a production release, so please check the pages look okay on all browsers! More info on the beta page and in the Change Log.
• 21/06/2020 - Released a new beta 6.02-2. You can now export as CSV your Inbox, Outbox (and the list of all drop-offs if you're an admin). Also all of those pages now have a means to toggle the visibility of each column.
• 19/06/2020 - Released a new beta 6.02-1. The main addition is that users can now edit the "Subject" line used when telling recipients about the new drop-off. More details are on the beta page and in the Change Log.
• 09/06/2020 - Released ZendTo 6.01-2. If, for any reason, the passphrase cannot be read when creating a new drop-off in response to a request, the new drop-off is now rejected immediately.
• 05/06/2020 - Released ZendTo 6.01-1. This allows you to change which columns are visible in the global list of all drop-offs. Also "autolist" has been improved to be able to handle much larger numbers of drop-offs.
• 04/06/2020 - Released ZendTo 6.0-2. This is a bug-fix release, no new features.
• 02/06/2020 - Released zendto-saml version 1.00. See the SAML documentation for instructions on how to use this.
• 31/05/2020 - Released new version 6.00.
  The big features in this release are:
  • Login via OAuth, Yubikeys etc with SAML-based authentication
  • Uploaded files are sent in small chunks with auto-retries
  • Users can reduce the lifetime of a drop-off
  • Recipients can be made to read a legal waiver before downloading files
  plus many other new features and fixes which are listed in the Change Log.
• 28/05/2020 - Added new 'autolist' command to list all data stored about every drop-off. See the automation page for more info on automating ZendTo and driving it from your own application code. See the beta page for instructions on how to download and install it.
• 21/05/2020 - Bug in Installer fixed, breaking CentOS and RedHat-based installations. The EPEL repo have moved their rpm and renamed their GPG key file.
• 20/05/2020 - Each chunk of a file being uploaded will now be retried up to 5 times before the upload is abandoned. See the beta page for more information.
• 19/05/2020 - Users can now individually set the lifetime of a new drop-off. The preferences.php settings impose a limit and a default value. Admin logins are now restricted to your local IP subnets by default, for improved security. See the beta page for more information.
• 13/05/2020 - File "chunks" support added. This can be used to automatically split the drop-off process into many pieces, to work around size limits imposed by network security appliances and services (e.g. free tier of Cloudflare). See the beta page for more information.
• 05/05/2020 - I have documented the entire SAML configuration process. It's not as complicated as it looks, just work through it carefully.
• 30/04/2020 - First beta release of SAML authentication support. This should allow you to use all sorts of different additional authentication mechanisms such as Microsoft Azure, OAuth, Shibboleth, Yubikeys, and even Twitter and Facebook. See the beta page for how to get started.
• 24/03/2020 - Bug-fix release 5.23-3. Fixed problems with getClientIP() calls, and added code to Debian 10 Installer (ClamAV stage) to work around ClamAV failing to virus scan uploaded files, producing a "Not a regular file" error in the ZendTo log. If you have this problem, download the Installer again and just tell it to do the ClamAV stage.
• 19/03/2020 - Bug-fix release 5.23-2. Fixed a problem which would make requesting a drop-off fail.
• 16/03/2020 - New production release 5.23-1. New Hungarian, Polish and Russian translations. New optional "terms and conditions waiver" feature, internaldomains.conf now allows individual email addresses, all external libraries updated, plus many other new features. See the Change Log for all the details.
• 22/02/2020 - New beta release 5.22-4. New preferences.php setting 'allowExternalRecipients' which can be used to stop even your logged-in internal users from being able to send files to people outside your organisation. See the setting in preferences.php for more details.
• 21/02/2020 - New beta release 5.22-3. The main new feature is a "terms and conditions waiver" which, if used (or mandated), will show every recipient some text of your choice, along with a checkbox they have to tick before they can see any of the download links/buttons. The supplied text explains briefly how to change that text and/or disable/mandate the feature for all new drop-offs. See the beta page for more information.
• 21/02/2020 - It appears Microsoft have pushed back this change so it will not happen until the 2nd half of this year. So no hurry!
• 08/02/2020 - Microsoft are now mandating the use of TLS when checking usernames/passwords against Active Directory (AD) servers. Please see the newly updated documentation for simple instructions on configuring ZendTo and your ZendTo server's OS to enable this.
• 31/01/2020 - New beta release 5.22-2. New Polish and Russian translations, some security fixes and new config options as requested by various users. Please see the Change Log. For installation, please read the Beta page.
• 29/12/2019 - New beta release 5.22-1. The Installer now supports CentOS 8, Ubuntu 19 and Debian 10. I have also fixed a bunch of other problems, please see the Change Log. For installation, please read the Beta page.
• 27/08/2019 - New production release 5.21-2. A few important bug-fixes, plus more intelligence when adding recipients so that you can just enter email addresses in "Name" boxes and not worry about it. Also improved the Installer so it configures zendto.conf.
• 09/08/2019 - New production release 5.21-1. The main new features are (1) a "Download all files as a zip" button on the download pages, which is useful if are picking up a drop-off containing lots of files, you're using Firefox and are sick of saying "yes, just save it, don't open it!". (2) Requests for drop-offs can now enforce encryption at the time of the request, including the passphrase that will be used. The person sending the files to you cannot find out the passphrase, nor disable the encryption. (3) You can put a system "message of the day" announcement at the top of the main menu page, for telling news to your users.
• 31/07/2019 - Beta release 5.20-9. Fixed bug where downloading large unencrypted drop-offs may run out of memory.
• 30/07/2019 - Beta release 5.20-8. The "request for a drop-off" form now has the "delete" buttons for editing your address book.
• 30/07/2019 - Beta release 5.20-7 with bug-fixes and text improvements from 5.20-5.
• 28/07/2019 - Another new beta release 5.20-5. When requesting a drop-off, you can do 2 new things. Firstly you can enforce encryption on the drop-off and set the passphrase so the sender of the files never knows it. Secondly you can stop it automatically sending the email, but instead just show you the link you need to give them. Then you can send it yourself, possibly by other means that are more secure.
• 17/07/2019 - New beta release 5.20-3. New preferences.php setting 'systemAnnouncementFilePath' to allow you to easily post a system-wide message on your ZendTo login/menu page. Read the preferences.php comments for details of exactly how you can use it. Please see the beta page for download information.
• 08/07/2019 - New beta release 5.20-2. On download pages, there is now a "Download All Files as a Zip" button which should help people who use browsers (such as Firefox) which prompt separately for every downloaded file. Please see the beta page and Change Log for more information.
• 18/06/2019 - New production release 5.19-1. Users can now delete entries from their address book. ZendTo can be automated: see the new "autodropoff", "autorequest" and "autopickup" commands, along with the new 'automationUsers' setting in preferences.php.
• 16/06/2019 - New beat release 5.18-5: Bug fixes.
• 02/06/2019 - New beta release 5.18-4: Picking up a drop-off can now also be done from a script. Run bin/autopickup without any parameters and it will show you the usage. It uses curl and jq to parse the JSON output. It can also be used to only fetch the drop-off's metadata in JSON.
• 10/05/2019 - Big News! Beta release 5.18-3: Both creating a new drop-off, and creating a request for a drop-off, can now be done automatically with no human intervention. The 2 scripts that do it are in bin/autodropoff and bin/autorequest. Run them without any parameters and they'll show you basically how to drive them. You will need to set up a new user specifically for the automation. See the comments above the new 'automationUsers' setting in preferences.php.
• 02/05/2019 - Beta release 5.18-2. Improved tooltips, and bugs from beta 1 squashes.
• 29/04/2019 - Beta release 5.18-1. The user interface has improved in a few areas such as you can now delete unwanted entries from your address book when sending new drop-offs. Lists of drop-offs now include tickboxes saying if they were encrypted, and if they have been picked up. The task of sending a request for a drop-off can now be scripted with the new "autorequest" tool (just run it for usage instructions). For other updates and download instructions, please see the Beta page and the Change Log.
• 11/03/2019 - Production release 5.17-6. Some logging bugs fixed, and the Installer improved again. RHEL8 support is on the way for the Installer. Further improved the upgrade tool, but best to run it with "--dry-run" the first time.
• 31/01/2019 - Beta release 5.17-5. The Beta Installer now supports FreeBSD as well. See the Beta page for instructions on how to download the Beta Installer. The "upgrade" tool is now a lot more intelligent, I suggest running it with "--dry-run" the first time to see what it will do.
• 23/01/2019 - Release 5.17-4. I have improved the "upgrade" tool and fixed an important encryption bug and a minor logging bug. See the Change Log for more details.
• 12/01/2019 - Release 5.17-1. This is a production release. There are new tools to simplify upgrading (upgrade) and extract a drop-off from the command-line (extractdropoff). 2 new languages, and lots of bug fixes. See the Change Log for more details.
• 23/12/2018 - Released beta version 5.16-7. This provides a new easy-to-use "upgrade" tool which saves you having to run upgrade_preferences_php and upgrade_zendto_conf by hand. Very simple: just run it. This release also fixes AD login problems.
• 19/12/2018 - Released beta version 5.16-6. Lots of bug-fixes and minor improvements. See the Change Log for details.
• 25/10/2018 - Released beta version 5.16-4. Improvements to speed and memory requirements when encrypting/decrypting. Improvements to extractdropoff utility.
• 24/10/2018 - Released beta version 5.16-3. Several bug fixes and other improvements suggested by users.
• 23/10/2018 - Released beta version 5.16-1. I have cleaned up the email messages so they are simpler when users are not checksumming files or providing descriptions. I have cleaned up some of the templates further. I have written a new "extractdropoff" command-line utility to extract a copy of the files from a given drop-off's ClaimID, and it will prompt for the passphrase if neeeded. Sites allowing checksumming and (particularly) encryption of large files should stop getting other uploads timing out if they are happening at the same time. Please see the Change Log and the beta page for more information.
• 05/10/2018 - Released 5.15-1. This is a production release. This contains a minor user interface improvement, more configuration control for admins, the removal of MyZendTo which no one has used for years, and the removal of a mis-feature. See the Change Log for more details.
• 03/10/2018 - Released beta version 5.14-4. Translations updated and a bug in the RPM spec file fixed. Layout of "Add Recipient" dialog in "New Drop-off" form improved, when text in buttons needs more than 1 line.
• 02/10/2018 - Released beta version 5.14-2. I have added more configuration options to give you finer control over the appearance of the "New Drop-off" form, and the "Add Recipient" box buttons have changed to make it easier for new users to know what to do. Please see the Change Log and the beta page for more information.
• 26/09/2018 - Removed feature that allowed the lone recipient of a drop-off to delete the drop-off. Fixes to the Installer for Ubuntu 18.04.1, and an update to the Dutch translation.
• 21/09/2018 - Released 5.13-1. This is a production release. There are many new features, improvements and fixes. Please see the top section of the Change Log for a brief summary.
• 18/09/2018 - Released 5.12-7 beta. This contains more user interface improvements as requested and suggested by users. Please see the beta page for download and installation instructions.
• 16/09/2018 - Improvements to simplify and speed up the user interface, especially when making new drop-offs. 2 clicks and 2 "what do I do now?" moments removed.
• 14/09/2018 - Beta bugs bashed. Please see the beta page for download and installation instructions.
• 13/09/2018 - First beta release of 5.12. The most useful new feature is that users can now change their language straight from the web site while using ZendTo. You can also hide every ".php" within the interface, so users won't immediately know it is written in PHP. There are also a whole host of other additions, plus fixes for all bugs I'm aware of. See the beta page for installation instructions, and the Change Log for more detailed info about what is new.
• 27/08/2018 - And today a very kind person from the Netherlands sent me the new Dutch translation.
• 26/08/2018 - One tiny new feature for sites who want to embed ZendTo within an iframe on their corporate website, and a couple of other tiny improvements. See the Change Log for more details.
• 23/08/2018 - It's a busy week! I have rolled back the cookieconsent library due to a bug in the latest version, and have added a new setting "ConfirmExternalEmails" (true by default) so that sites don't have to bother external senders with the "do you own this email address" confirmation check.
• 22/08/2018 - Version 5.11-3 released. I have fixed all the known bugs, and added a new preferences.php setting 'X-Frame-Options' to control use of that HTTP header.
• 21/08/2018 - I have added SLES 15 support to the Installer, along with GPG signing support for all OSes.
• 20/08/2018 - I have moved the website to https, and the repositories and packages are now all signed. If you are using the repositories, please see either the yum or apt pages as you will need to use the new repository package.
• 10/07/2018 - Production release of version 5.11. Mostly minor additions to resolve issues and missing config options with 5.10. The "OrganizationShortType" setting in zendto.conf should now include "the" on the front, which makes it much easier for many sites to successfully customise the user interface for their company name. The main menu has been cleaned up. The installer now fully supports the cryptography library on SUSE 12sp3 and openSUSE Leap 15, in addition to all the other supported platforms. To upgrade from 5.10, a quick yum/apt/zypper package upgrade should do it. To upgrade from earlier than 5.10, please download and run the Installer as that will automatically do the big PHP upgrade you will most likely need.
• 02/07/2018 - I have documented the new encryption and decryption feature so you can quickly see what it does, how and why.
• 29/06/2018 - Production release of version 5.10. The major new features in this release are secure encryption/decryption of drop-offs using a user-supplied passphrase, and a "Download All Files" button to save lots of clicking. To upgrade to this version, please download and run the Installer as that will automatically do the big PHP upgrade you will most likely need.
• 23/06/2018 - I am getting close to a production release now, including all the encryption features. The ZendTo installer (beta version of it right now) will upgrade your system to the required version of PHP and its modules, without upsetting the rest of your system configuration. Just run it all the way through. I have tested the installer's ability to upgrade on CentOS, RedHat, Ubuntu and Debian. I would be really grateful if people could download and test this for me. See the beta page for more information.
• 20/06/2018 - Release 5.09-4 beta. This optionally does secure encryption and decryption of drop-offs, has a new "Download All Files" button on the pages that let you download drop-offs, and for those with users in the EU it offers a pop-up asking new users to agree to storing cookies and GDPR consent for using their name and email address. Note the "Download All Files" button does not work (or show) on Internet Explorer. See the beta page for more information, and the Change Log.
• 01/06/2018 - Release 5.04-6 beta. This has a new "Download All Files" button on the pages that let you download drop-offs. Note it does not work (or show) on Internet Explorer. See the beta page for more information, and the Change Log.
• 30/05/2018 - Release 5.04-5 beta. There are only security fixes to ZendTo itself. The main point of this release is the beta of the installer now includes support for SUSE Enterprise (tested on SLES 12sp3) and openSUSE Leap 15. See the beta page for more information, and the Change Log.
• 31/03/2018 - Released version 5.03. The lifetime of a 'request for a drop-off' is now fully exposed to the users. The "About" page text is improved. A security bug has been squashed. Please see the Change Log for details.
• 27/02/2018 - A couple of minor bug fixes, including an automatic DB schema fix for old MySQL setups. Please see the Change Log for details.
• 21/02/2018 - Released version 5.02. A few minor bug-fixes, and a new option 'emailSenderIP' which you can set to false which will remove senders' IP addresses and hostnames from any email messages which are sent.
• 07/02/2018 - Released production version 5.01. The biggest change from Version 5.00 is the addition of a checksum for each file in a drop-off. It also fixes all known bugs in Version 5.00. Please see the Change Log for details.
• 04/02/2018 - Released 5.01-3 beta. This version adds checksums (SHA-256 by default) for each file in a drop-off, provided the checksum calculation won't take too long. See the Change Log for details. It also fixes the known bugs.
• 01/02/2018 - Released 5.00-2. The changes to ZendTo itself are minimal, see the Change Log for details. However I have improved the installer so it no longer needs to rebuild PHP at all on CentOS and RedHat 6 and 7 systems, but instead uses stock RPMs that are well maintained by others (Rackspace). To replace your current custom PHP with a stock one, just run stage 2 then stage 5 of the installer.
• 22/01/2018 - Production release of the major new version 5.00. Please read the upgrade instructions if you are upgrading, there are major changes you need to know about before you upgrade or it will possibly not work. See the Change Log for information about the new features offered in ZendTo version 5.