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Clarifying Support for Alternate Login ID for Skyp...

Please note that it is now possible to configure an alternate login ID (in some circumstances) for Skype for Business/Lync. This will most likely be of interest in cases where end users have email or SIP addresses that differ from their UPN and/or a UPN that is non-routable (jdoe@contoso.local).

You can read full requirements and other important technical details in the Windows IT Center.

Configuring Alternate Login ID