Uninstall Exchange 2013 and install Exchange 2010 - Uninstallation failed


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 ?


Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
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:

It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.