There are no known issues that I'm aware of. I ran with about 50 DC's at 2003 Gold and about 20 at 2003 SP1. All servers were DC's and Global Catalog servers to boot. You might be having replication problems unrelated to service pack level. ________________________________ From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Jeff Pitsch Sent: Friday, March 31, 2006 8:35 AM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: How can I find known issues with mixed SP1 Active Directory servers ? What sort of problems are you seeing? The first place to look would be MS's support site. Jeff On 3/31/06, Andy <andysideas@xxxxxxxxx> wrote: Dear All, We are having a number of problems that people seem to be blaiming on Citrix (you know how it is) We have a single domain with AD servers some running SP1 and other not. How can I find known issues with mixed SP1 Active Directory servers ?