Hello,
We have also released Update Rollup 7,RU 7, for Exchange Server 2010 Service Pack 3.
You can read about all the details on :
To get the RU7 just follow this link :
http://www.microsoft.com/en-us/download/details.aspx?id=44023
The complete list of issues resolved in Exchange Server 2010 Service Pack 3 Update Rollup 7 can be found in KB2961522
Cheers,
João Ribeiro