Microsoft had released some day’s ago Rollup 1 for Exchange Server 2007 Service Pack 3
In this release two important things are fixed when you have a CCR Cluster
– Log Truncation is failing on a CCR cluster after installing SP3
– Exchange Writer should return TRUE for retry able errors
The whole list with fixes can you find HERE
Download Rollup 1 for Exchange Server 2007 Service Pack 3 HERE