ITS will upgrade the Lync 2013 server infrastructure to Skype for Business Server 2015. During this three-hour window all Lync and Skype for Business services will be unavailable.

This includes instant messaging, audio/video calls and online meetings. For individuals who use Lync/Skype for Business as a telephone solution (Enterprise Voice) this service will also be unavailable. 

Lync 2010, Lync 2011 for Mac, Lync 2013 and Skype for Business clients will be compatible with the upgraded server software. ITS recommends upgrading Windows computers to the latest Skype for Business 2016 client for the best user experience. Skype for Business for Mac is the current production client for Mac OS X. Lync 2010 and Lync 2013 clients will be compatible with the upgraded server software, but will not provide the same level of functionality as the new clients.