User experience during Phase 9 of Migration
Microsoft Office Communications Server 2007 and Microsoft Office Communications Server 2007 R2 will reach end of support on January 9, 2018. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.
If you have already moved all users who were homed on a server, server deprecation should have no impact on users.