Uninstall Exchange 2013 and install Exchange 2010 - Uninstallation failed

Hi,

we got a little problem here. We set up a new domain with Server 2012R2. After that we setup an Exchange 2013
on another machine. After everything was installed we were told that the clients still uses Outlook2003. They cant
change to office 2007 or newer at the moment.
So we uninstalled Exchange 2013 to install Exchange 2010 instead.
Something went wrong. Exchange says, that it cant be uninstalled, because there where some mailboxes left.
I know, that you can delete them with Shell:

Get-Mailbox-Database"Mailbox Database <id>"| Disable-Mailbox
Get-Mailbox-Database"Mailbox Database <id>"-Archive| Disable-Mailbox- Archive
Get-Mailbox-Database"Mailbox Database <id>"-Arbitration| Disable-Mailbox-Arbitration-DisableLastArbitrationMailboxAllowed
Remove-MailboxDatabase-Identity"Mailbox Database <id>"

But the shell says, that winRM-Client cant work.... FullyQualifiedErrorId: -2144108297, PSSessionOpenFailed

It cant connect to exchange.

So is there any chance to delete exchange 2013 completly (there is no data stored in any mailbox yet) and install exchange 2010 on this machine or
have we to install a new machine? Or is the problem located in ActiveDirectory? and if, what to do then ?

Thanks

loosain
loosainAsked:
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Miguel Angel Perez MuñozCommented:
INMO you can not go to Exchange 2010 on a easy way. When you does setup, Exchange 2013 modified AD schema. Since you not do modifications for Exchange 2010 and does for Exchange 2013, you can not back to Exchange 2010.

You must delete all AD and re-create from scratch.
AmitIT ArchitectCommented:
No roll back as said above. I can help in removing 2013, however that won't allow you to install Exchange 2010. Also note, client upgrade should be the first priority. Whenever you install Exchange server, you should also upgrade the client to latest or supported outlook or office version.

If this is a new domain, best you recreate it again.

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loosainAuthor Commented:
We have installed Outlook 2007 an completly installed DC and Exchange from the scratch. But now we got another problem. look and help here please:

http://www.experts-exchange.com/questions/28756499/Exchange-2013-doesn-t-talk-to-my-activedirectory-domain.html
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