Hi, I need to transition from Exchange 2003 to Exchange 2013. For a testing purposes, I have virtualized my production environment, before I go live and first I start with transitioning to Exchange 2010. In my virtual environment, I made successful transition from 2003 to 2010. I transfer all the mail boxes and public folder and everything has worked fine. After that, I try to uninstall the Exchange 2003 and there is a problem. It wont uninstall, as should be. I looked to the forums several solutions and I have tried everything, but nothing helped. On the end, I removed the Exchange 2003 forcefully from ADSIEDIT. I removed the components in exchange tree, but I dont quite remember, what I removed exactly. The solutions was posted on some of the forums. And again, everything looked fine, until now, when I try to prepare schema for Exchange 2013. Now he finds remainings of Exchange 2003 and it wont continue with installation. In EMC 2010 in server list, Exchange 2003 is not listed in the Organization summary, only Exchange 2010 exist. Does anyone have idea, what to do? Regards, Aleksandar

http://support.microsoft.com/kb/833396 Make sure there are no Exchange 2003 servers in the AD environment. Click Start, point to Programs, point to Windows 2000 Support Tools, point to Tools, and then click ADSI Edit.Expand the following items: Configuration Container CN=Configuration, DC=<var>Domain_Name</var>,DC=com CN=Services CN=Microsoft Exchange CN=<var>Your_Organization_Name</var> CN=Administrative Groups CN=<var>Your_Administrative_Group_Name_Or_Exchange5.5_Site_Name</var> CN=Servers Sounds like you did this, but 2013 is just looking for a specific value in an attribute that may still be around in AD.

It looks like I missed something. You were right. Thanks. AleksandarAleksandar B. MCITP