Knowledge Base

What to do when you are unable to use CodeTwo software after a major Windows 10 update


After one of the major Windows 10 updates (e.g. feature update to Windows 10, version 1607) you are unable to use CodeTwo software. For example, you are unable to connect to your Syncing Master in CodeTwo Public Folders or the synchronization with your iCloud calendar is not working (CodeTwo Sync for iCloud).

Before you go further ensure that you have the latest available version of the software


We have discovered that particular Windows 10 updates can cause malfunction of our applications. The main idea to get these applications working again is to perform a safe uninstallation (so your data and configuration are preserved), then install the applications again.

To solve this issue, please follow the steps appropriate for your product:

CodeTwo Public Folders

Mostly, the only issue that can be encountered is that the Syncing Master service cannot be started and you are receiving the following error:

Could not start the Windows service name service on Local Computer.
Error 1053: The service did not respond to the start or control request in a timely fashion.

To get rid of that error you have to reinstall the Syncing Master module, as per this article.

CodeTwo Sync for iCloud

We have discovered that MAPI associations between CodeTwo Sync for iCloud and the Outlook folders created by iCloud for Windows are no longer valid. To resolve this issue you have to perform a reinstallation of both CodeTwo Sync for iCloud and iCloud for Windows.

  1. Uninstall CodeTwo Sync for iCloud:
    1. Hit Windows + R.
    2. Type in appwiz.cpl.
    3. Right-click CodeTwo Sync for iCloud and choose Uninstall.
  2. Do not remove any additional files or folders.
  3. Uninstall iCloud for Windows.
  4. Remove information about iCloud folders from Outlook:
    1. Open Outlook.
    2. Go to File > Account Settings.
    3. On the Email tab, remove the account associated with your iCloud account (if there is one), as shown in Fig. 1.
    4. Go to the Data Files tab and remove the file associated with your iCloud account, as shown in Fig. 2.
    5. Your iCloud folders in Outlook (in Contacts, Calendars and Tasks) will still remain, but they should now be empty. Remove all of these folders: right-click each of them and choose Delete Folder from the shortcut menu.

Fig. 1. iCloud-associated account that needs to be removed.

Fig. 2. iCloud data file that needs to be removed.


  1. Download and install the latest version of iCloud for Windows.
  2. Ensure that Mail, Contacts, Calendars, and Tasks option is enabled in iCloud for Windows. You may need to disable and then re-enable this option.
  3. Download and install the latest version of CodeTwo Sync for iCloud.

CodeTwo Exchange Sync

We have discovered that the service does not start despite being enabled. To resolve the issue you need to perform a standard reinstallation: 

  1. Uninstall CodeTwo Exchange Sync.
  2. Do not remove any additional files or folders.
  3. Download and install the latest version of CodeTwo Exchange Sync.

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