Service Pack 4 for BlackBerry Enterprise Server 5 is available for Novell GroupWise today. This same service pack was made available for BlackBerry Enterprise Server 5 for Microsoft Exchange and Lotus Domino back in September. In addition to the latest feature enhancements, Service Pack 4 will allow you to upgrade your BlackBerry Enterprise Server to BlackBerry Enterprise Service 10 once it is available in conjunction with the launch of BlackBerry 10 devices.
Key new features include:
BlackBerry Mobile Fusion integration
BlackBerry Balance capabilities
Microsoft Office 2010 attachments support
The ability to export data from into .CSV or .XML files for reporting and reference
Enhancements and stability improvements to BlackBerry Administration Service
I'm with (sic) Verizon, so I don't have an official os update yet. But, I loaded the latest leaked 10.1 on my spare Z and haven't noticed a difference.