
Coexistent:
You can coexist between Lync Server 2013 and Skype for Business Server.

You can coexist between Lync Server 2010 and Skype for Business Server.
Tri-existence:

Tri existence is not supported.
In-Place Upgrade:

You can do in-place upgrade from Lync Server 2013 to Skype for Business Server.

You cannot perform in-place upgrade directly from Lync Server 2010 to Skype for Business Server. Follow the standard migration path.

If you want to perform in-place upgrade from Lync Server 2010 to Skype for Business Server. First migrate Lync Server 2010 to Lync Server 2013 and then you can do in-place upgrade from Lync Server 2013 to Skype for Business Server.
Direct Migration:

You can select the direct migration path from Lync Server 2013 to Skype for Business Server.

Direct migration from Lync Server 2010 to Skype for Business is available but if the customer have coexist environment between OCS 2007 R2 & Lync Server 2010 then they must have to migrate everything to Lync Server 2010 and after that only migration to Skype for Business will be available.
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