We are migrating systems form Lync 2010 to 2013 and exchange 2010 to 2013. Both will have 2010 and 2013 coexisting for a long time into the future.
Can all of the new settings for Lync 2013 and Exchange 2013 working together be in place without affecting (breaking) any of the users still on the 2010 systems?
The Lync 2010 is an Enterprise Pool\site and the Lync 2103 is a Standard site\pool. Only test users are left on the Lync 2010 pool. we are slowly migrating all the settings and such to the 2013, i.e trusted application servers etc.
Exchange 2013 has been implemented and co-exists with the 2010. We will have some users on exchange 2013 and some on 2010 still.
Adding OAuth and Partner applications, etc won't break anything correct?