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FAQ

Category: Troubleshooting, Version 5.x, Version 6.x/7.x

Duplicate e-mails can occur on an POP3 account, when e-mails from more than one computer being synchronized are requested from the e-mail server. This is the case if the Outlook function “Leave copy of messages on the server” was activated in a POP3 E-mail account.

The tricky here is that SimpleSYN cannot force Outlook to stop downloading an email a second time on another computer. If the first computer downloads the mail from the email server and it gets synchronized before the second computer downloads it, Outlook cannot detect that the email is already there. The second computer will than download the email from the email server and you got a duplicate. As the first email is also already synchronized, SimpleSYN assumes that the second download is intentional and synchronizes this copy too.

In this case deactivate the Outlook function “Leave copy of messages on the server” so as not to save e-mails in your mail server and download them repeatedly.

To deactivate this function follow these steps:

  1. Open Outlook
  2. Open the Backstage area by clicking on “File“
  3. In the category “Information” click on “Account Settings” and “Add or Remove Accounts…”
  4. Highlight the POP3 E-mail account in question and click on “Change“
  5. Click on “More Settings“
  6. In the tab “Advanced” deactivate the check box “Leave copy of messages on the server“
  7. Confirm the changes by clicking “OK“
  8. Click on “Next“ and then on “Finish“

If you are using a current version of Outlook:

  1. Open Outlook
  2. Open the Backstage area by clicking "File"
  3. In the "Information" category, click "Account Settings" and then "Add or Remove Accounts..."
  4. Select the affected POP3 email account and click "Change"
  5. In the next dialog, uncheck the "Leave a copy of all messages on the server" checkbox
  6. Confirm the changes by clicking "Next"

Category: Troubleshooting, Version 5.x, Version 6.x/7.x

If you have made changes to the Outlook default color categories, you must ensure that the color category list (formerly the "Main Category List") is manually configured identically on all PCs. SimpleSYN does not automatically synchronize this list. The categories assigned to the items are retained and correctly synchronized by SimpleSYN.

Starting with version 6, the "Add new categories to the main category list" function is available.

If this option is enabled, SimpleSYN checks during synchronization whether all categories used in the items are also present in the main category list. If a category is missing, it is automatically added to the list with a default color. You can then manually adjust the color to ensure a consistent display across all devices.

Category: Troubleshooting, Version 2.x / 3.x

With a lifetime license, new major versions are not installed automatically. Instead, they are displayed in the user interface under "Information." This is how we inform customers with a lifetime license that a new major version is available. Lifetime license customers have the opportunity to test the new major version and can manually initiate the download from the user interface.

Would you like to stay with version 2?

Please first uninstall version 3 via Windows > Settings > Apps > Installed Apps.

Afterwards, you can download and reinstall version 2 from the following page:
https://www.simplesyn.net/Media/Default/Downloads/Mobile/2.8.13611/SimpleSYN_Mobile.exe

After that, everything should work as usual again.

If you want to stay with version 2, you can also deactivate the upgrade notice as follows:

Simply click “Do not show this upgrade again” in the update dialog to stop receiving further upgrade notifications.

Some more information about the licenses:

With a lifetime license, there are no additional monthly/annual costs. The license entitles you to unlimited use of the licensed version (e.g., version 2.0). Minor updates (e.g., version 2.0 to version 2.0.1, etc.) are free. Upgrades to new major versions (e.g., version 2.x to version 3) are subject to a fee, but are of course optional. Subscription licenses include both minor updates and upgrades to new major versions.

Category: Troubleshooting, Version 5.x, Version 6.x/7.x

How to activate the Outlook add-in in SimpleSYN:

  1. Open the SimpleSYN main window on your PC.
  2. Go to “Options” and then to “Advanced Options.”
  3. Check the box for “Enable Outlook Add-In.”
  4. Save the settings.
  5. Then restart SimpleSYN.

Additional note:
Open Outlook and go to “File” > “Slow and deactivated COM Add-Ins.”
Check if the SimpleSYN add-in has been disabled there. If so, please re-enable it.

Category: Troubleshooting, Version 2.x / 3.x

In the SimpleSYN Mobile application on the Windows PC, under “Options > advanced options”, change the value for the “http port”, e.g. instead of “9238” > “9240”.

Then click on the link “Click here to update Windows configuration” to adjust the changed configuration.

Restart SimpleSYN Mobile and create the SimpleSYN Mobile account on the smartphone again.

Category: Troubleshooting, SimpleSYN Mobile, Version 2.x / 3.x

If you set up the SimpleSYN Mobile account on the mobile device and made a mistake when entering the e-mail address or the password, there will be no error message with the old Android versions, but the settings are incomplete and synchronization cannot take place.

Make sure that "Server" displays a longer string of numbers and letters, followed by ".simplesyn.app".

If only"simplesyn.app" is displayed in "Server", you probably have typed in a wrong email address or password. In this case, tap the back arrow and check the email address and password details.

Category: Troubleshooting, Version 5.x, Version 6.x/7.x

The message "destination folder was not found" appears if the top folder level in Outlook (eg "Personal folders") has been named differently on the SimpleSYN client and SimpleSYN server. In this case, SimpleSYN can not assign the destination folders automatically because no new PST files are created by SimpleSYN.

Click on the "Select a different target folder" link and select the folder where you want to sync.

Alternatively, you can name the highest folder level identically on all computers in advance.

Category: Installation, Troubleshooting, Version 6.x/7.x

This message indicates that SimpleSYN cannot be installed on your computer because you are probably using an ARM processor.

SimpleSYN is only compatible with Windows 11 or 10 on computers with classic x86 or x64 processor architectures (Intel or AMD). Installation on ARM-based systems is not supported.

Category: Operation, Version 5.x, Version 6.x/7.x

Your Outlook data is not stored online in the cloud. Therefore, all computers must be turned on at the same time for synchronization to occur – this also applies to the Business version of SimpleSYN.

If a computer is currently unavailable (e.g., turned off or without an internet connection), synchronization will automatically resume as soon as the computer is back online and SimpleSYN can establish a connection to the main computer (server).

All changes or newly created Outlook items will be detected and automatically synchronized.

Note for the Business Edition:
SimpleSYN can be run as a Windows service. This means that no user login is required when Windows starts – synchronization can take place even without an active user session.

Category: SimpleSYN Mobile, Version 2.x / 3.x

For setting up the synchronization on the device, a special SimpleSYN Mobile account of the type "Exchange ActiveSync" is created.

During the first synchronization, the data is synchronized from Outlook to the mobile device. Changes made in this account after the first synchronization are always synchronized by SimpleSYN Mobile to both sides (bidirectional).

E-mails, appointments and contacts that were saved on the mobile device before the first synchronization, i.e. that are not in the SimpleSYN account, are not synchronized to Outlook because they use different accounts. If you also want to keep this data up to date in the future, make sure that this data is also available in Outlook before the first synchronization.

Category: SimpleSYN Mobile, Version 2.x / 3.x

There is usually no need to install an additional app on your mobile device. For setting up the synchronization on the device, a special SimpleSYN Mobile account of the type "Exchange ActiveSync" is created.

Before SimpleSYN Mobile can be used for synchronization, you must set up SimpleSYN Mobile once, configure the devices you want to synchronize and connect them to SimpleSYN Mobile.

The setup process therefore includes two steps:

  1. Installing and setting up the SimpleSYN Mobile software on your Windows ® PC with Outlook ® installed.
  2. The configuration on your devices (e.g. smartphone).

During setup on the PC, a SimpleSYN Mobile pseudo email address is automatically generated. The address has the ending @simplesyn.app and is required to establish a connection from your device.

You can find more information about the setup on this page.

Category: Operation, Troubleshooting, SimpleSYN Mobile, Version 2.x / 3.x

The earliest date that the Google Calendar app can display is January 1, 1970. The appointments were synchronized correctly, but cannot be displayed in the app.

For birthdays, we recommend storing them in contacts. Older appointments can also be added there and the calendar app displays them correctly.

Category: General, Installation, Version 5.x, Version 6.x/7.x

In the standard configuration (both in the Business and Standard versions), SimpleSYN requires an active Internet connection. SimpleSYN uses this connection to contact a central server operated by SimpleSYN, which facilitates the connection between the SimpleSYN server and the SimpleSYN client.

Only the information necessary to establish the connection is transmitted — your Outlook data is never stored in the cloud. Afterward, SimpleSYN attempts to establish a direct connection between the participating installations. The best available connection method is selected automatically.

All communication is always encrypted using SSL or TLS. Outlook data is never transmitted in plain text or permanently stored on our servers — it is only forwarded directly and securely.

Why does the Standard version also use this method?
Since most users today have an internet flat rate, we decided to use the central server in the Standard version as well — however, with the limitation that the connection is only established within the local network.

Using SimpleSYN without an Internet Connection

If you would like to use SimpleSYN without an internet connection or without our central server, then there is the option of changing the connection configuration so that our central server is no longer necessary.

Important:
This setting is primarily intended for the Standard version. In the Business version, synchronization will only work within the same local network after switching to this mode — synchronization over the internet will no longer be possible.

How to activate the custom connection (from version 5):

  1. Open the SimpleSYN main window.
  2. Go to Options > Advanced Options.
  3. On all PCs (server and clients), enable the option “Custom connection mode”.
  4. On each client, enter the computer name or the static IP address of the SimpleSYN server in the field “Custom server name/address”.

Category: Troubleshooting, Version 5.x, Version 6.x/7.x

The item was most likely deleted manually in Outlook on one of the PCs by mistake. SimpleSYN then automatically synchronized this deletion to the other devices.

Important to know:
SimpleSYN can only synchronize a deletion if an actual action has taken place beforehand – such as a manual deletion, a move, or removal by another program or add-in.

By default, SimpleSYN automatically creates a backup whenever an item is deleted.This allows you to recover accidentally deleted items or folders.

How to find the backup:
On the PC where the deletion was synchronized, open Outlook and go to:
SimpleSYN toolbar > Restore deleted items

There, you can easily restore the deleted items or folders.

Additional notes on how SimpleSYN works:

SimpleSYN operates on a per-folder basis.
So if you move an item from one synchronized folder to another, SimpleSYN treats this as a "deletion" in the original folder. In this case, a backup is also created – even though the item was only moved, not deleted.

Other possible causes for deleted items in Outlook include:

  • Other synchronization tools
  • Exchange Server or other server-based services
  • Auto-archiving
  • Outlook rules or QuickSteps

Category: Installation, Purchase, SimpleSYN Mobile, Version 2.x / 3.x

SimpleSYN Mobile licenses in version 2 (one-time payment) are unfortunately not valid for the main version 3.

Licenses are offered as a one time payment or by subscription.

One-time payment:
With a one-time payment, there are no additional monthly or annual fees. The license entitles you to use the licensed version (e.g., version 3.0). Minor updates within this version (e.g., from 3.0 to 3.0.1) are included free of charge. Upgrading to a new major version (e.g., from version 3.x to version 4) is subject to a fee but is, of course, optional.

Subscription:
With a subscription license, all minor updates and upgrades to new major versions are included

If you are interested in version 3, you can test the new main version free of charge for 30 days.

Category: Installation, Troubleshooting, Version 5.x

Please check which major version of SimpleSYN Standard/Business you originally purchased.

If you purchased an older major version (e.g., version 5 or version 4), you probably have the current major version 6 installed. You can view the version number in the main window under "Information".

If this is the case:

Unfortunately, the old licenses are no longer valid for new major versions, hence the message.

Please note: Licenses are offered as a one time payment. There are no additional costs per month/year. The license entitles you to use the licensed version (e.g. version 5.0). Minor updates within this version (eg version 5.0 to version 5.0.1 etc.) are included. Upgrading to a new major version (eg version 5.x to version 6) are subject to a fee, but optional.

If you wish to stay with your current version, first uninstall version 6. Then reinstall the major version you purchased.

You can download older major versions from the following page:
https://www.simplesyn.net/en-US/additional-downloads

After installation, your old license file will be accepted again.

Interested in version 6?

If you would like to upgrade to version 6, you will receive a 20% discount on the same number of licenses.

Simply send us an email to support@simplesyn.net with your order number and the purchase date.

Category: Version 2.x / 3.x

The new Outlook app is not supported.

The following classic Outlook® versions are supported:

  • Microsoft/Office 365® with Outlook® (x86/x64)
  • Outlook® 2024 (x86/x64)
  • Outlook® 2021 (x86/x64)
  • Outlook® 2019 (x86/x64)
  • Outlook® 2016 (x86/x64)

Category: Troubleshooting, Version 5.x, Version 6.x/7.x

If you receive this message, please follow these steps:

Check the Outlook version in SimpleSYN:

  1. Open the SimpleSYN main menu on this PC.
  2. Go to “Options” > “Advanced Options”.
  3. Under “Outlook Version”, select the version you actually have installed (e.g., Outlook 2024).
  4. Save the settings and restart SimpleSYN.

Reinstall SimpleSYN:

  1. If the issue persists, uninstall SimpleSYN:
    • Open “Windows > Settings > Apps > Installed Apps”.
    • Find SimpleSYN in the list and uninstall it.
  2. Then reinstall SimpleSYN.

Repair your Office installation:

  1. If the problem still occurs after reinstalling SimpleSYN, repair your Office installation:
    • Again, go to “Windows > Settings > Apps > Installed Apps”.
    • Find Microsoft Office, click “Modify”, and choose the “Online Repair” option (do not select quick repair).
    • Follow the on-screen instructions.

Category: Troubleshooting, Version 5.x, Version 6.x/7.x

Here's what to do if the folder list in the synchronization settings remains empty and no folders are displayed:

  1. Completely close Outlook and SimpleSYN on the affected PC.
  2. Then restart both programs.

If the issue persists, please check the following points:

  1. Set the correct Outlook version:
    • Open SimpleSYN.
    • Go to “Options” > “Advanced Options”.
    • Under “Outlook Version”, select the version you actually have installed (e.g., Outlook 2021 or Outlook 2016).
    • Save the settings and restart SimpleSYN.
  2. Check permissions:
    • Make sure that both Outlook and SimpleSYN are started without administrator rights.
  3. Verify the Outlook profile:
    • In SimpleSYN, open the main menu > Options.
    • Ensure that the same Outlook profile is used as when starting Outlook.

Category: Troubleshooting, Version 2.x / 3.x

Please restart both devices (Windows PC and smartphone) first.

Note: An active internet connection is required for synchronization. All participating devices must be turned on at the same time for synchronization.

Then check the following points:

Type of Synchronization

The data on the mobile device can either be:

  • synchronized manually, or
  • automatically synchronized via push.

Important:
Push synchronization occurs immediately only for new entries. Changes or deletions may be synchronized with a delay of up to 15 minutes. The automatic update interval depends on the device's manufacturer and system.

Check whether you have enabled push for the SimpleSYN Mobile account on your device.

Enable Push Synchronization on iOS

  1. Open settings of your Apple iOS device.
  2. iOS version 12 and 13: Tap “Passwords & Accounts” 
    iOS / iPadOS version 14, 15, 16 and 17: Tap “Mail”, “Contacts”, “Calendar”, or “Notes” and then tap “Accounts”.
    iOS / iPadOS version 18, 26: Open Apps, Tap „Mail“, „Contacts“, „Calendar“ or „Notes“ and then tap “Accounts”.
  3. Tap “Fetch new Data” at the bottom.
  4. Enable Push if it is not already activated.
  5. Make sure that Push is selected for the SimpleSYN Mobile Exchange account (not 'Fetch' or 'Manual')."

Manual Data Synchronization on iOS:

Alternatively, you can manually trigger the synchronization of individual data items. On Apple iOS, for example, you can initiate a manual sync using the “pull down” gesture within the respective app (e.g., Calendar).

Example:
If you want to manually sync the calendar on iOS, first open the Calendar app. Then switch to the list view and perform the pull-down gesture. A spinning sync icon will appear, indicating that the synchronization process has started.

How to enable push on Android

The names of the menu items may differ slightly depending on the Android version and manufacturer.

  1. Open the settings of your Android device.
  2. Tap “Accounts and Backup”.
  3. Tap “Manage Accounts”.
  4. Under "Manage Accounts," tap your created SimpleSYN Mobile Exchange account (@simplesyn.app).
  5. Tap “Account settings”.
  6. Tap your created SimpleSYN Mobile Exchange account again.
  7. Tap “Sync frequency”.
  8. In “Sync frequency” select “Automatic (Push)”.

Manual data synchronization on Android:

On Android, manual data synchronization can be done in the menu of the respective app by tapping "Refresh", or by the “Pull Down” gesture.

Depending on the system, manufacturer and apps, manual updates are triggered differently on Android. If you have detailed questions about where or with which gesture you can initiate the manual sync of the individual data, please contact your manufacturer.