If you are interested in Server Virtualization and Server Application development - today is a good day to be at Build 2015 (or following it online).
Two big sessions to recommend are:
Nano Server: A Cloud Optimized Windows Server for Developers
Time: April 30, 2015 from 2:00PM to 3:00PM
Online: http://channel9.msdn.com/Events/Build/2015/2-755
Windows Containers: What, Why and How
Time: April 30, 2015 from 5:00PM to 6:00PM
Online: http://channel9.msdn.com/Events/Build/2015/2-704
Cheers,
Ben