This week Microsoft released the new version of Office (https://blogs.office.com/2015/09/22/thenewoffice/) and with that came a new version of Skype for Business.
I installed this on all of my machines including 1 of my customer, they use an older version of Lync and I got an message that the server version is not compatible with the client.

I had this before with the previous versions of Office so I headed over to the blog of my colleague
Albert Hoitingh who had a registry key for the previous versions.
So to get this working I used that same registry key and change it from 15 to 16 and everything is working again.

The key is: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Office\16.0\Lync\DisableServerCheck

If it does not exists, you need to create the path towards it. The key “DisableServerCheck” is a DWORD key and should have the value set to “1”

Also posted on MicrosoftHelden

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