Lync 2010 – Cannot Synchronize Address Book

If you receive this error:

The Lync 2010 client or the Office Communicator client does not download the corporate address book and displays a notification: “Cannot Synchronize Address Book”

Give the following a shot:

  1. Shutdown the Lync client
  2. Force the Lync client to download the address book immediately the next time it starts:
    • Open the registry to HKLM\Software\Policies\Microsoft\Communicator
    • Modify (or Create) the DWORD  the registry key “GalDownloadInitialDelay” and set it to 0  (that is a zero)
    • This can also be done from the command line:
      • reg add HKLM\Software\Policies\Microsoft\Communicator /v GalDownloadInitialDelay /t REG_DWORD /d 0 /f
  3. Delete the Existing Local Address Book Files:
    • On Windows 7 or Vista machines, open Windows Explorer to the directory:
    • Delete the files GalContacts.db and GalContacts.db.idx
  4. Restart the Lync client.
    •    The address book should be available in less than an hour.

I found the solution here: http://blog.insidelync.com/2012/02/lync-address-book-client-synchronization-errors-and-common-problems/  Give it a read, it’s very thorough.

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