This post has been updated here:
With the latest round of Rollups for Microsoft Exchange 2007 and Exchange 2010 I thought it was worth a quick post to detail the new Build Numbers, so you can quickly confirm if you are on the latest build.
On SBS 2008 and 2011 the Rollups are available via WSUS and Windows Update so this is the quickest way to see if you need to apply them.
The Rollups released in May 2013 were:
Update Rollup 1 for Exchange 2010 SP3 (KB2803727)
Build Number: 188.8.131.52
The Cumulative Update 1 (CU1 released in April:
Exchange 2013 CU1 (KB2816900)
Build Number: 15.0.620.29
The Rollups released in February 2013 were:
Exchange Server 2010 SP3 (KB2808208)
Build Number: 14.03.0123.003
Update Rollup 6 for Exchange 2010 SP2 (KB2746164)
Build Number: 14.02.0342.003
Update Rollup 10 for Exchange 2007 SP3 (KB2788321)
Build Number: 8.3.098.3
The Rollups released in December 2012 were:
Update Rollup 5 v2 for Exchange 2010 SP2 (KB2785908)
Build Number: 14.2.328.10
Update Rollup 8 for Exchange 2010 SP1 (KB2787763)
Build Number: 14.1.438.0
Update Rollup 9 for Exchange 2007 SP3 (KB2746157)
Build Number: 8.3.297.2
Released in Novemebr 2012:
Exchange 2013 RTM
Build number 15.0.516.32
For a full list of build numbers head over to the Technet Wiki here.
1. How to check which version of Microsoft Exchange you are using?