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Exchange Team Blog released new version of Update Rollup 8 for Exchange 2010 SP3.
You can download it here:
Update Rollup 8 For Exchange 2010 SP3 (KB2986475)
When you install this update your system version will change to: 14.3.224.1
All informations about changes included in RU 8 for Exchange 2010 SP3 can be found here: KB2986475