Archive for the ‘Lync 2010’ Category

Microsoft Lync 2010 Client – Cannot sign in because the server version is incompatible

October 19, 2011

I am using Lync 2010 to access an Office Communications Server 2007 server and received the above error. In general Greg Olsen’s blog post helped me, but my registry entry was slightly different. Might be a configuration thing with the environment we have here…

Instead of:
HKEY_CURRENT_USER > Software > Policies > Microsoft > Communicator

I had to use:
HKU > S-1-5-21-[more long code here] > Software > Policies > Microsoft > Communicator

I discovered this by using the Windows Process Monitor and tracking what registry key it was looking for. A quick search for DisableServerCheck in the monitor found the appropriate key.

Once you find the correct location (there should already be some REG_DWORD entries in the key) you can create a new entry call DisableServerCheck of type 32-bit DWORD, then set it to the value 1. After exiting and restarting Lync 2010 client, it should log on to your existing OCS 2007 servers.