Exchange Schema

I have a client who recently decided to migrate from GroupWise to Exchange 2013.  During the course of the roll-out a few glaring compatibility issues became apparent and they decided to remove Exchange 2013.  They are actually having problems even doing that, but that is another post.

The question is...  Now that the AD schema has been extended for Exchange 2013, can they install a clean Exchange 2010 server in their environment or has the damage been done?  There are no other Exchange servers in the environment.
JadedFanAsked:
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Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
Without Auth-restore from System state backup you cant revert the Schema

- Rancy
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
If you have SystemState backup you can roll back and then work on it :)

http://social.technet.microsoft.com/Forums/exchange/en-US/fd7d8115-8afc-473e-8416-b2b4d60f87ff/exchange-2010-in-a-exchange-2013-environment?forum=exchangesvrgeneral

Edit: Also if you never had an Exchange 2010 server in this organisation before, then installing Exchange 2010 after upgrading the schema to 2013 is not supported.

- Rancy
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JadedFanAuthor Commented:
Is there a way to roll back the schema extension with out a system state or authoritative restore?  This client's idea of backups is to use Double-Take so a System State may not be available.
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JadedFanAuthor Commented:
Thanks to all for your answers.  We successfully rolled-back the schema, Installed EX2010 and are rockin'.
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JadedFanAuthor Commented:
Authoritative restore was not needed.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Wow .... if you ever had Exchange 2007 or 2010 earlier than there wouldnt be issues, without that would surely be eager to know how it was done :)

- Rancy
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