SimpleSYN supports the latest Outlook generation, but remains downward compatible with the previous versions
NEW: Supports Outlook 365 from the Microsoft Store
SimpleSYN not only supports the normal Outlook installation version of Office 365, but also Office 365 installed from the Microsoft Store
NEW: Support for HTTP(S) Proxy Server
SimpleSYN can now be operated in networks that use HTTP (S) proxy servers
NEW: Advanced network settings
The network connections used by SimpleSYN can now be configured in the advanced options. In the advanced options it is also possible to activate a user-defined connection, for example to run SimpleSYN on local networks without an internet connection
NEW: Improved conflict resolution and conflict detection
Faster conflict resolution directly in the conflict list, as well as improvements in conflict detection
Improved performance Greatly improved performance during in the initial synchronization, as well as in the transmission of multiple elements
Improved synchronization Improved change detection, improved error handling, and improved detection of different synchronization states
Improved support for high resolution displays SimpleSYN has been optimized for displays with high DPI
Improved synchronization of distribution lists Distribution lists with many recipients are better supported
Improved selection of folders in the sync settings Default folders are now mapped, even if the folder names are different (for example, sent items <> sent objects)
Revision of how the filter works (business version) If the filter settings for an already synchronized folder change in the future, filtered-out items are not visible anymore for SimpleSYN and are considered a deletion
Optimized data transfer for changes
Improved export / import of data
Many other improvements and optimizations
Bug fixes
Version 4.1 (Build 11323) released 5/24/2018:
Updated EULA
Fixes a problem with starting SimpleSYN
Bug fixes and optimizations
Version 4.1 (Build 11107) released 3/7/2018:
Fixes a possible crash when renaming an Outlook folder
Version 4.1 (Build 10931) released 2/2/2018:
NEW: Items that exist on both computers are now set to “read” during the initial synchronization, if the read state differs between the items
Fixes a problem that caused items to disappear for a short time until they are synchronized again
Fixes two rarely occurring crashes
Minor enhancements and bugfixes
Version 4.1 (Build 10104) released 5/4/2017:
Fixes a problem when synchronizing sub folders
Version 4.1 (Build 10102) released 5/2/2017:
Fixes a crash when filters were assigned
Version 4.1 (Build 10026) released 4/25/2017:
Performance enhancements
Better handling for watching Outlook folders
Fixed an issue: A second instance of SimpleSYN could be started if the first instance was run by the Windows service
Fixed an issue: If the configuration was not accessible, SimpleSYN crashes
Bug fixes and optimizations
Version 4.1 (Build 9822) released 3/6/2017:
NEW: It is now possible to select in the options, if and when items are completely removed, which were deleted during the synchronization
NEW: It is displayed whether SimpleSYN is installed as 32-bit or 64-bit
Fixed an issue: SimpleSYN could fail to access the Outlook data file after some time. This required a restart of SimpleSYN
Fixed an issue: It was possible that a deleted folder was still selected for the synchronization. This lead to error messages
Fixed an issue: Changes during the synchronization on the SimpleSYN server were probably not detected immediately, because the folder was not checked for further changes
Fixed an issue: The connection could be lost if a synchronizing folder was moved or deleted on the SimpleSYN client
Fixed an issue: The warning message for Firewall settings in the “Status” dialog could not be closed permanently
Better support for high DPI systems
Other bug fixes and enhancements
Version 4.0 (Build 9202) released 8/3/2016:
Fixes a problem that caused SimpleSYN to detect too many changes
Enhances the initial synchronization
Fixes a bug in the duplicate finder that caused the detection of wrong duplicates
Fixes a bug when synchronizing deletions with Exchange
Other optimizations and bug fixes
Version 4.0 (Build 8702) released 3/2/2016:
Fixes a problem when synchronizing a distribution list
Version 4.0 (Build 8701) released 3/1/2016:
Prevents the message “The operating system is not presently configured to run this application” when using Outlook 2016 click-to-run and choosing Outlook 2016 in the advanced options
Minor optimizations
Version 4.0 (Build 8624) released 2/24/2016:
Enhances the reliability of the synchronization
Version 4.0 (Build 8221) released 10/21/2015:
NEW: The setup now also detects traditional MSI based installations of Outlook 2016
Version 4.0 (Build 8219) released 10/19/2015:
Fixes a wrong configuration setting when using custom connection configurations
Fixes a rare crash when using the internet synchronization
Version 4.0 (Build 8124) released 9/24/2015:
Fixes a problem of build 8121 that causes the client to stay offline after the connection has failed
Fixes a problem that prevented the client from connecting after the server was set to “paused” for a short time
SimpleSYN Mobile version history
Version 3.7 (Build 14603) released 2/4/2026:
Fixes an exception that occurs when closing SimpleSYN Mobile.
Version 3.6 (Build 14312) released 11/13/2025:
NEW: Improved validation of advanced options to prevent invalid configurations.
Fixed: Crash when closing SimpleSYN if another instance was active.
Fixed: Changes to the message text or notes field of contacts and appointments were sometimes not detected and only synchronized after an additional modification.
Various internal improvements and optimizations.
Version 3.5 (Build 14028) released 8/28/2025:
It is no longer possible to disable both HTTP and HTTPS simultaneously under “Advanced Options,” preventing configuration errors.
A rare crash that could occur when opening or closing data files in Outlook has been resolved.
Improves the behavior when exiting SimpleSYN Mobile
Version 3.4 (Build 13629) released 4/29/2025:
Fixed a synchronization issue with some apps, including 'Task & Notes'.
Fixed an issue where the synchronization process could not be stopped after an Office update.
Version 3.3 (Build 13610) released 4/10/2025:
Fixed an issue with the display of images in synchronized emails.
Fixed a problem where the synchronization process sometimes did not restart after an Office update.
Version 3.2 (Build 13520) released 3/20/2025:
Fixes a potential issue with message body synchronization.
Version 3.1 (Build 13506) released 3/6/2025:
Fixes an issue that caused synchronization to stop unexpectedly.
New Version 3.0 released 2/25/2025
NEW: .NET 8: SimpleSYN Mobile now uses .NET 8.
NEW: Integrated Web Server: Instead of the Windows HTTP service, an independent web server is now used.
NEW: Additional Language Packs: SimpleSYN has been automatically translated into the following languages. Please report errors and suggestions for improvement via the feedback function:
Czech
Danish
Greek
Spanish
French
Italian
Dutch
Polish
Portuguese
NEW: Outlook 2024: Support for Outlook 2024.
Improved reliability with Office updates.
Feedback Function: The feedback function has been improved.
The folder path is now displayed under status.
The password can be displayed during input.
Changes to the hostname are no longer possible when using the HTTP relay service.
Fixes an issue that prevented the "Deleted Items Folder" from syncing, causing deletions from the device to fail.
Version 2.8 (Build 13611) released 4/11/2025:
Fixes an issue that caused synchronization to stop unexpectedly.
Fixed an issue with the display of images in synchronized emails.
Fixed a problem where the synchronization process sometimes did not restart after an Office update.
Version 2.7 (Build 13115) released 11/15/2024:
Fixes a bug that sometimes caused the initial setup dialog to not be displayed.
Version 2.6 (Build 12417) released 4/26/2024:
Fixes a compatibility issue with Samsung apps and improves the reliability of the synchronization in general.
Version 2.5 (Build 12321) released 3/22/2024:
Fixes an issue when moving an item from one folder to another. This also applies to deleting an item from an device.
Version 2.4 (Build 12214) released 2/14/2024:
Changes behavior in the event of potential conflicts. If an item is changed in Outlook, simultaneous changes are now still applied by the end device, as long as no synchronized data fields have been changed. For any other change, conflict resolution is left to the end device. As a rule, this means that the changes are copied from Outlook and changes to the end device are overwritten.
Changes the behavior when an device sends unexpected or additional data fields. This data will now be ignored and the synchronization will continue. Previously, the synchronization of the affected item was rejected with an error.
Fixes an error when synchronization reply-to email recipients in the x64 version.
Fixes a possible vulnerability in the SimpleSYN installer component.
Changes of the available CALs are now applied in a more timely manny, without the need of a manual activation.
Minor bug fixes and optimizations.
Version 2.3 (Build 11920) released 11/20/2023:
Fixes an issue that prevented a retrial period when upgrading from version 1 to version 2. If you have purchased a lifetime license for SimpleSYN v1, you can now test it again free of charge for a full 30 days after installing v2.
Deleting a device's sync status may only work if sync was manually disabled in advance.
The "Configuration" page has been improved when using a large number of user accounts.
Version 2.2 (Build 11818) released 10/18/2023:
When SimpleSYN Mobile and the sync process are running as administrator, the sync process was not detected as started. The status display of the end devices was also not available. Note: We recommend that you do not run SimpleSYN and Outlook as administrators for security reasons.
