No issues whatsoever with Exchange Server 2013 and Office 365. One of my friends related he's got issues with Server 2010, but he's had issues off and on with 2010 for some time - I'm trying to get him off 2010 as it was a moving target and onto 2013 or O365. I'm running 8.0.2 on a VZW iPhone 6 and 8.1B1 on a VZW iPhone 5 and iPad Air - my friend is running 8.0.2 on a VZW iPhone 5.