We've prepped AD, schema and domains using Exchange 2007 SP3. Do we have to do this again to install Exchange 2010 SP1? I understand that some of the required AD updates for Ex2010 are included in SP3 for E7. Ted

you would need to prepare schema as the "RangeUpper" attribute for Cn=Ms-Exch-SchemaVerion-pt for 2007 sp3 is 14625 and for 2010 SP1 14726 Schema changes in 2010 Sp1 http://technet.microsoft.com/en-us/library/bb738144.aspx Here is how to http://technet.microsoft.com/en-us/library/bb125224.aspx Thank you Dhruv

Thanks Dhruvaraj, but where are you finding that attribute? I've run ADSchemaRef and it reports 14718 for 2010 SP1 ms-Exch-Schema-Version-Pt. Ted

i have checked this value on a prodcution env that i support. it is 14726 for 2010 Sp1Dhruv

Of course, you need to prepare AD again. I would like to take an example. As we know, preparing AD will create several security groups and grant appropriate permissions. Exchange 2010 has a new feature named RBAC, it requires Exchange 2010 has more security groups. Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.