Did you upgrade to iOS version 7 ?
Maybe that might be part of the issue.
Are you using Ghost Pattern software to gain access to GroupWise? If so, they have an update for iOS 7.
If you are using the ActiveSync protocol (Exchange) to connect to GroupWise, then all testing with iOS 7 looks good.
If you have been connecting in all this time with your Apple devices, what connection method have you been using all this time?
I hope it is using the ActiveSync method (Exchange) as outlined here http://support.apple.com/kb/HT2480
This is the preferred method for GroupWise using the GroupWise Mobility Service (which is ActiveSync).