Today it was announced that Service Pack 2 for Exchange 2010 is released.
Many of us were looking forward to it since it will give some feature’s that were requested like GAL segmentation and ABP.

Download link:
http://www.microsoft.com/download/en/details.aspx?id=28190

FYI; there is also a schema update included in this SP, most likely to prepare for O365 coex and/or E15

What’s new in Exchange 2010 SP2
http://technet.microsoft.com/en-us/library/hh529924.aspx

Release Notes
http://technet.microsoft.com/en-us/library/hh529928.aspx

For more information around the GAL segmentation follow the link below
http://blogs.technet.com/b/exchange/archive/2011/01/27/3411882.aspx

If you find issues related to SP2, post them as comments on the blog and create a post at
http://social.technet.microsoft.com/Forums/en-US/exchangesoftwareupdate/threads