Fixes an error in the folder hierarchy synchronization. If Outlook returned an internal error while opening a folder, it was possible that SimpleSYN deleted this folder accidentally instead of stopping the synchronization.
Version 5.0 (Build 12812) released 8/15/2019:
Fixes a crash when Outlook is returning an unexpected error.
Version 5.0 (Build 12806) released 8/7/2019:
NEW: Improves the performance when starting SimpleSYN.
NEW: Improves the mapping of items during initial synchronization.
Resolves a possible crash due to errors in third-party MAPI datastores.
Resolves a very rare connection problem that could cause SimpleSYN to hang with 100% CPU usage.
Smaller bug fixes and tweaks.
Version 5.0 (Build 12711) released 7/12/2019:
NEW: Improved initial synchronization between different versions of Outlook. For example, different separators in messages, or incorrectly formatted links, are handled better, eliminating duplicates during initial synchronization.
NEW: After SimpleSYN starts, the folder hierarchy is always transferred once to synchronize changes to it more quickly.
NEW: Subject line prefixes are now transferred separately to correctly represent custom values. Custom prefixes also could have lead to duplicates when a resynchronization takes place.
Improves error handling for custom Outlook data fields that cannot be resolved. As a result, synchronization may have stopped and continued incorrectly.
Resolves an issue if the synchronization state on the server has been deleted. If only a few items were synchronized once, the client did not recognize the required resynchronization and the synchronization was performed incorrectly.
Version 5.0 (Build 12621) released 6/24/2019:
Improves reliability when importing items with unexpected data
Version 5.0 (Build 12614) released 6/14/2019:
Fixes an error while deleting data fields. This error led to faulty synchronization with Outlook version 1906 (Build 11727.20104) and newer
Fixes an error when enabling or disabling the Outlook add-in via "advanced options"
Version 5.0 (Build 12613) released 6/13/2019:
Fixes a problem that date values greater than 12/31/9999 23:59:59.9 could cause a crash or a cancellation of the synchronization
Fixes a crash that could occur due to incorrect error handling when accessing Outlook items
Fixes a discontinuation of synchronization if an attachment could not be synchronized correctly
Smaller bug fixes and tweaks
Version 5.0 (Build 123604) released 6/4/2019:
NEW: Improves the reliability of the connection when using IPv4 and IPv6 simultaneously
NEW: Improves support for local proxy servers such as Fiddler
Fixes an error that could lead to a disconnection if the connection used an relay server
Fixes an error when closing a relayed network connection
Fixes a problem that an unexpected data type within an Outlook item may cause an interruption of the synchronization
Fixes a problem that leads to no data file being available for the synchronization, if the Outlook profile contains an error
Removes a misleading log entry
Version 5.0 (Build 12526) released 5/26/2019:
Fixes the error handling for invalid Unicode characters. Invalid characters could have caused a folder to stop synchronizing.
Version 5.0 (Build 12523) released 5/23/2019:
Fixes an error that could lead to an invalid sync status if a pre-copied PST file was used on both computers. In this case, it was no longer possible to synchronize.
Fixes a recovery synchronization error with new items. In rare cases, it could have happened that one element was assigned to a deleted item on the other side and subsequent synchronization of that element was no longer possible.
Fixes a wrong configuration parameter in the SimpleSYN Windows service, which prevents SimpleSYN from starting automatically with Windows.
The standard Outlook data file is again correctly labelled as such in the user interface.
A poorly scaled status indicator on high-resolution monitors on the server side has been corrected.
Fixes an error when items are deleted from the synchronized folder during synchronization.
Version 5.0 (Build 12517) released 5/17/2019:
Fixes an error during the recovery synchronization of a deleted item
Fixes an rare crash when handling Outlook events
Fixes an crash during initialization of folder monitoring
Fixes a rare crash during connection establishment
Fixes a wrong version number
Version 5.0 (Build 12515) released 5/15/2019:
Added some missing digital signatures
Fixes a crash when exiting SimpleSYN, that may occur when shutting down Windows
Fixes a rare crash when saving the SimpleSYN configuration
New Version 5.0 released 5/6/2019
NEW: Supports Outlook 2019 (Office 365)
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
SimpleSYN Mobile version history
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.
Version 2.1 (Build 11806) released 10/6/2023:
Addresses a compatibility issue that arises when using iOS 17, where certain appointments were displayed as meeting invitations instead of regular appointments. Note: If your appointments were erroneously synchronized, please disable calendar synchronization in your iOS device's account settings and then re-enable it.
New Version 2.0 released 9/8/2023
NEW: Version 2.0 is available to all subscription users at no extra cost. Users of the lifetime license of SimpleSYN Mobile 1.x are recommended to purchase an upgrade. If the current license is also valid for version 2, the new version will be installed automatically.
NEW: On the "Devices" page it is now shown whether a device is connected and synchronizing. The following states are distinguished:
1. Offline: Device is not connected and there is no data available when the device was last connected. The icon of the device is grayed out.
2. Online: It shows for several minutes that a device is connected or has been recently. The device's icon is displayed in blue, but changes to gray after 30 seconds.
3. Sync: While data is being transferred, the device icon is displayed in blue and with a sync animation.
4. Push Sync: If a device is connected and has activated push synchronization, the device icon is displayed in green.
In addition to the different device icons and colors, a text with identical status information is displayed.
NEW: Displays detailed messages about the status of the connection and error messages under "Information".
NEW: Birthdays from contacts can be skipped when synchronizing the calendar. This prevents the birthdays from being duplicated in iOS and other calendar apps.
NEW: Contains the Outlook add-in known from SimpleSYN with additional functions:
Restore Deleted Items: Allows you to restore items that were deleted during synchronization.
Find duplicates: Searches an Outlook folder for duplicates and similar items and allows you to quickly clean up found duplicates.
NEW: The synchronization status of devices can be deleted.
Improved: Deleted items backed up during synchronization can be automatically deleted after a configurable period of time.
Improved: The options on the configuration page have been better arranged.
Improved: Allows to start without user login and without specifying a Windows password.
Improved: The configuration of the advanced options now directly shows the required changes to the Windows configuration. The adjustments can be made quickly with one click.
Improved: The status display of the synchronized data can be sorted.
Improved: The icon in the notification area is now also displayed in gray if the connection to the central servers does not exist. Previously, it only represented whether the sync process was executed.
Improved: Outlook no longer needs to be started to send e-mails so that e-mails can be sent immediately. Note: This requires the use of the default Outlook profile.
Improved: Performance has been optimized in many places.
Improved: A link to the privacy policy has been added under "Information".
Improved: Allows you to disable hardware acceleration of the UI, either via a setting under "advanced options" or via the command line parameter "/rendermode softwareonly". This makes it possible to circumvent display problems on some systems, especially when accessed via remote maintenance software.
Improved: Deleted folders no longer appear under "Devices".
Improved: The product ID in the "About" dialog can now be copied.
Improved: When creating error reports, the path can now be copied.
Many more bug fixes and optimizations.
Version 1.8 (Build 11806) released 10/6/2023:
Addresses a compatibility issue that arises when using iOS 17, where certain appointments were displayed as meeting invitations instead of regular appointments. Note: If your appointments were erroneously synchronized, please disable calendar synchronization in your iOS device's account settings and then re-enable it.
Fixes issues when synchronizing SMIME signed emails. Signed emails were not shown correctly and attachments were missing.
Version 1.7 (Build 11506) released 7/10/2023:
Fixes an error when replying or forwarding an email. If the replied or forwarded email contained an invalid HTML body, the new email failed to be sent.
