I have active directory on Server 2012 R2. I installed Exchange Server 2013 on a separate machine and updated schema but after a week I uninstall (clean) Exchange 2013 and format the PC. Now I want to install Exchange 2010, when I run setup /prepareschema it gives me an error, "The active directory schema version 15312 is higher than setup's version 14734. Therefore, PrepareSchema can't be executed." I don't have any backup of Active directory to restore at a previous stage when it had it's original schema (before Exchange 2013). How to overcome this issue? Can I install Exchange 2010 in current scenario?
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