Our SLES10 build machines have been updated to SP3, and starting with 5.0.20 and 6.0.3, will be certified against that release.
The SLES11 64-bit system is tested to the full extent of all of our other platforms. The release documents for 6.0.3 will be updated to reflect this.
Let me know if you have further questions.
Sr. Member of Technical Staff
A Division of VMware, Inc.
Zimbra :: the leader in open source messaging and collaboration