When we try to upgrade our active directory to R2 we are getting the following error: "isSingleValued" attribute value for objects defined in Windows 2000 schema and extended schema do not match. A previous schema extension has defined the attribute value as "TRUE" for object "CN=memberUid,CN=Schema.CN=Configuration,DC=ourdomain,DC=org" differently than the schema extension needed for Windows 2003Server. Adprep cannot extend your exsisteing schema We have change our schema because we run a mixed environment of mac and windows clients. Thanks ahead for any help.

Messing with the schema is a tricky thing.There is a hotfix that *might* help you out. Check out this KB article: http://support.microsoft.com/kb/919938 I do it quite a biton my lab systems and I occasionally break something.If the abovefix does not help you, can you edit your memberUid extension and match it up with what the ADPREP program is trying to do? Here is a URL from someone that had similar issues: http://forums.techarena.in/showthread.php?t=422863 If you are not exactly sure which way to proceed, I would invest some money in a PSS call. As long as you get a decent person on the line (which is getting harder and harder with Microsoft PSS - Are you listening Microsoft?) then it is a very good investment.

Hi, This is the forum for Exchange. I recommend you to use Windows Active Directory to get relevant help. Discussions in Active Directory http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.windows.server.active_directory Besides,you can refer to the below article: Incorrect Schema extension for OS X prevents ForestPrep from completing in Windows 2000 http://support.microsoft.com/kb/887426/en-us Hope it helps. Xiu