Originally posted on June 19, 2015.
Beginning June 23rd, faculty, staff, and graduate students using Lync 2013 for Windows will see the new Skype for Business client after restarting their Lync 2013 for Windows client.
Microsoft has provided screenshots of the differences between Lync 2013 and Skype for Businees. That page is available here(external link).
Change is for Windows Lync 2013 only
This change ONLY affects individuals running the Lync 2013 client. Mac clients and Windows Lync 2010 will NOT be affected by this change.
Skype for Business vs. Skype
The Skype for Business and consumer Skype clients are two separate clients. Both clients can run on the same device, but they are two distinct applications.
If you are using the Skype consumer client, you will log in with a Microsoft account or a Skype ID and password. Skype for Business uses the campus Active Directory username and password for login.
In addition, when most people log into Skype for Business, they will see their University contacts. When someone logs into the consumer Skype client, they should see a list of their personal contacts.