Connect Lync 2010 Client to OCS 2007

Let’s say you’re upgrading your OCS environment to Lync 2010 and you want to install Lync client on your work stations prior to moving your users to the new Lync 2010 pool.

If you’ll try to connect Lync 2010 client to OCS 2007 you’ll get an error, even after you enabled the OC version in OCS.

To bypass that, you’ll have to disable the Lync client server check.

Copy the following text to your text editor and save it as a .reg file, then double-click to update to registry:

Windows Registry Editor Version 5.00

You can also run the following command:

reg add HKCU\Software\Policies\Microsoft\Communicator /v DisableServerCheck /t REG_DWORD /d 1 /f

Now you can easily sign in to OCS using your Lync client.

8 thoughts on “Connect Lync 2010 Client to OCS 2007

    1. I didn’t test that, it’s subject to MS policy in BPOS.
      I’d give it a try, tho I think they’re saving Lync to Office 365.

      1. Does this solution work even on 64 bit PC? For some odd reason, I get the same message everytime I try to login saying server version is incompatible with the Lync 2010. Is there any service pack for Lync 2010 or other recommendation? Thanks!

      2. Yes, this works for all versions.
        You should also check your client version filter on the server to make sure it allows connections from your client version.

    1. Hi Ben,
      Unfortunately, there’s no fix for the address book issue, as Lync 2010 client works differently from the Communicator client.

  1. i tried the registry fix but lync 2010 intermittently disconnecting and reconnecting. any suggestions on how to fix that?

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