Version 6.x

Category: Troubleshooting, Version 5.x, Version 6.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: Installation, Version 5.x, Version 6.x

An active internet connection is required for synchronization using SimpleSYN Business and SimpleSYN Standard.
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.

If a computer using the SimpleSYN Business version is to be synchronized over the internet, but a direct connection between the SimpleSYN server and client cannot be established — for example, due to firewalls, routers, or NAT — SimpleSYN will use a relay server as a last resort. This allows communication even in networks where only outbound traffic is permitted.

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.

Note: 
Proxy server support is available starting with SimpleSYN version 5. For older versions, access to our servers at services.simplesyn.net must be explicitly allowed.

SimpleSYN requires the following outbound TCP connections.

DNSIP-AddressPorts
Version 6 and version 5:
SimpleSYN
Server & Clients		 services.simplesyn.net
services2.simplesyn.net
Relay connections (Turn Server)		 20.113.6.16
20.113.6.17
20.113.6.16/29		 443
443
49152 – 59152
Version 4:
SimpleSYN
Server		 services.simplesyn.net
services2.simplesyn.net		 20.113.6.16
20.113.6.17		 9235, 9236,
3478
SimpleSYN
Clients		 services.simplesyn.net
services2.simplesyn.net
Relay connections (Turn Server)		 20.113.6.16
20.113.6.17
20.113.6.16/29		 9235, 9236
3478
49152 – 59152

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

IMAP accounts store your emails directly on your email provider's server. This means your emails are automatically synchronized across all your devices.

Important:
Since IMAP already automatically synchronizes email folders (such as Inbox, Sent Items), additional synchronization of these folders with SimpleSYN is not possible. This would lead to conflicts. Therefore, SimpleSYN does not display these email folders in the "Synchronization Settings" on the client.

 Even though email folders cannot be synchronized with IMAP, other local Outlook data such as:

  • Calendar
  • Contacts
  • Tasks
  • Notes

can be easily synchronized with SimpleSYN. 

If you also want your email folders to be synchronized via SimpleSYN, you should use a POP3 account on all PCs instead.

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

When using the automatic synchronization it is also possible to synchronize all Outlook® subfolders automatically. The Outlook® subfolders will use the same synchronization direction and settings as their parent folder. Changes to the folder hierarchy below a selected folder are being synchronized.

Changes of the selected parent folder are not automatically synchronized. If a selected parent folder is being moved or deleted, the synchronization of this folder and all of its children will stop and is marked with a red X in the synchronization settings.

If you would like to continue synchronizing this folder at the new location, check the assignment of the folder in the synchronization settings on the client PC and save the page.

Moved subfolders are being deleted and completely resynchronized on the remote computer Deleted folders are also deleted on the remote side; all data inside the folder will be deleted in this case.

Category: Installation, Version 5.x, Version 6.x

SimpleSYN is a Client-/Server application. In your SimpleSYN network one PC must be configured as a server. The SimpleSYN server must be authorized in the Windows Firewall and/or Desktop firewall.

Please make sure that SimpleSYN is allowed in your personal firewall.

SimpleSYN must communicate with our servers located at services.simplesyn.net.

SimpleSYN requires the following outbound TCP connections.

DNSIP-AddressPorts
Version 6 and version 5:
SimpleSYN
Server & Clients		 services.simplesyn.net
services2.simplesyn.net
Relay connections (Turn Server)		 20.113.6.16
20.113.6.17
20.113.6.16/29		 443
443
49152 – 59152
Version 4:
SimpleSYN
Server		 services.simplesyn.net
services2.simplesyn.net		 20.113.6.16
20.113.6.17		 9235, 9236,
3478
SimpleSYN
Clients		 services.simplesyn.net
services2.simplesyn.net
Relay connections (Turn Server)		 20.113.6.16
20.113.6.17
20.113.6.16/29		 9235, 9236
3478
49152 – 59152

Category: General, Version 5.x, Version 6.x

The trial versions of SimpleSYN Standard, Business, and Mobile offer the full range of features.

During the trial period, SimpleSYN Standard and Business will only display a notification window upon startup, indicating the remaining trial time, which you must manually confirm.

You can test SimpleSYN free of charge and without obligation for 30 days. After the trial period, further use without a license is no longer possible.

Category: General, Version 5.x, Version 6.x

The SimpleSYN Business Version, in addition to all the features of the standard version, offers:

  • Synchronization over the Internet.
  • Filter function - for synchronizing certain Outlook items.
  • Windows service - start SimpleSYN automatically even if no user is logged on to Window.
  • Advanced synchronization options for reminders, categories and read status (version 6 and newer).

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

SimpleSYN does not synchronize your Outlook data at fixed intervals, but rather as needed. As soon as the SimpleSYN client and server are connected, synchronization runs automatically and almost in real time.

After the initial synchronization, only actual changes to your Outlook data are synchronized – for example, new emails, modifications, or deletions.

Example:
If you create a new calendar appointment, edit, delete, or move an existing one, this change is immediately synchronized across all connected computers. SimpleSYN checks whether the appointment already exists in the calendar.

  • If the appointment does not exist yet, it will be synchronized.
  • If it already exists, it will only be synchronized if it has been modified.

If a computer is currently unavailable, synchronization will automatically resume as soon as the devices are reconnected.

Category: Purchase, Version 5.x, Version 6.x

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 6.0). Minor updates within this version (eg version 6.0 to version 6.0.1 etc.) are included free of charge. Upgrading to a new major version (e.g., from version 6.x to version 7) is subject to a fee but is, of course, optional.

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

If you receive this message, please follow these steps:

Check the Outlook version in SimpleSYN:

  • Open the SimpleSYN main menu on this PC.
  • Go to “Options” > “Advanced Options”.
  • Under “Outlook Version”, select the version you actually have installed (e.g., Outlook 2021).
  • Save the settings and restart SimpleSYN.

Reinstall SimpleSYN:

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

Repair your Office installation:

  • 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 (not the quick repair).
    • Follow the on-screen instructions.