Exchange 2007 Builds Numbers

If you open de Exchange Management Shell and you run the following powershell command:
Get-ExchangeServer | fl name,edition,admindisplayversion you get the Build Number from your Exchange 2007 Servers

Exchange 2007 RTM

Product name Build number
Exchange 2007 RTM 8.0.685.25
Update Rollup 1 for Exchange Server 2007 8.0.708.3
Update Rollup 2 for Exchange Server 2007 8.0.711.2
Update Rollup 3 for Exchange Server 2007 8.0.730.1
Update Rollup 4 for Exchange Server 2007 8.0.744.0
Update Rollup 5 for Exchange Server 2007 8.0.754.0
Update Rollup 6 for Exchange Server 2007 8.0.783.2
Update Rollup 7 for Exchange Server 2007 8.0.813.0

Exchange Server 2007 Service Pack 1

Product name Build Number
Microsoft Exchange Server Exchange 2007 SP1 8.1.240.6
Update Rollup 1 for Exchange Server 2007 Service Pack 1 8.1.263.1
Update Rollup 2 for Exchange Server 2007 Service Pack 1 8.1.278.2
Update Rollup 3 for Exchange Server 2007 Service Pack 1 8.1.291.2
Update Rollup 4 for Exchange Server 2007 Service Pack 1 8.1.311.3
Update Rollup 5 for Exchange Server 2007 Service Pack 1 8.1.336.1
Update Rollup 6 for Exchange Server 2007 Service Pack 1 8.1.340.1
Update Rollup 7 for Exchange Server 2007 Service Pack 1 8.1.359.2
Update Rollup 8 for Exchange Server 2007 Service Pack 1 8.1.375.2
Update Rollup 9 for Exchange Server 2007 Service Pack 1 8.1.393.1
Update Rollup 10 for Exchange Server 2007 Service Pack 1 8.1.436.0

Exchange Server 2007 Service Pack 2

Product name Build Number
Microsoft Exchange Server 2007 SP2 8.2.176.2
Update Rollup 1 for Exchange Server 2007 Service Pack 2 8.2.217.3
Update Rollup 2 for Exchange Server 2007 Service Pack 2 8.2.234.1
Update Rollup 3 for Exchange Server 2007 Service Pack 2 8.2.247.2
Update Rollup 4 for Exchange Server 2007 Service Pack 2 8.2.254.0

Exchange Server 2007 Service Pack 3

Product name Build Number
Microsoft Exchange Server 2007 SP3 83.6