So you have been waiting to migrate your Exchange 2010 environment to Exchange 2013.You need to wait for Service Pack 3, well the wait is over, well sort of…….Exchange 2010 Service Pack 3 is now available, read the full release here. However there is a very big caveat, you cannot migrate/co-exist until Cumulative Update 1 for Exchange 2013 is released sometime this quarter. So you will have to put those migration plans on hold for a little while longer however if you want to download Exchange 2010 Service Pack 3 it can be found here.