I have successfully installed Exchange 2013 CU1 on Server 2012 with an existing SBS2008 server that has Exchange 2007. I wanted to try moving one mailbox to the 2013 database but when I click on the Migration in the ECP an error pops up that says "The user does not have an Exchange mailbox" even though there are no migration listed.

If I add a new migration batch, I can get all the way through until the end and then I get that error again.

I decided to try and move a mailbox using Exchange Management Shell and the mailbox moved with no problems (that I can tell).

Any idea what could be causing this error in the ECP?

Hi,

Did you access the ECP from the BE server?

If not, please have a try and let us know the result.

Thanks

Mavis

I attempted both from the Exchange server itself and a remote machine. Same problem on both.

Sounds similar to an issue when doing a search:

http://support.microsoft.com/kb/2702446

http://blogs.technet.com/b/exchangesearch/archive/2011/09/20/discovery-search-fails-w-error-quot-the-user-does-not-have-an-exchange-mailbox-quot.aspx

That may have something to do with it. When I run...

Get-Mailbox -Arbitration |fl name, alias

I get...

Name  : SystemMailbox{1f05a927-cb59-4d68-8b38-1c63ed6f0c67}
Alias : SystemMailbox{1f05a927-cb59-4d68-8b38-1c63ed6f0c67}

WARNING: The object swcc.local/MyBusiness/Users/SBSUsers/SystemMailbox{1f05a927-cb59-4d68-8b38-1c63ed6f0c67} has been
corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Database is mandatory on UserMailbox.
WARNING: Database is mandatory on UserMailbox.
Name  : SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}
Alias : SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}

WARNING: The object swcc.local/MyBusiness/Users/SBSUsers/SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c} has been
corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Database is mandatory on UserMailbox.
WARNING: Database is mandatory on UserMailbox.
Name  : SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}
Alias : SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}

WARNING: The object swcc.local/MyBusiness/Users/SBSUsers/SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9} has been
corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Database is mandatory on UserMailbox.
WARNING: Database is mandatory on UserMailbox.
Name  : Migration.8f3e7716-2011-43e4-96b1-aba62d229136
Alias : Migration.8f3e7716-2011-43e4-96b1-aba62d229136

WARNING: The object swcc.local/MyBusiness/Users/SBSUsers/Migration.8f3e7716-2011-43e4-96b1-aba62d229136 has been
corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Database is mandatory on UserMailbox.
WARNING: Database is mandatory on UserMailbox.
Name  : FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042
Alias : FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042

WARNING: The object swcc.local/MyBusiness/Users/SBSUsers/FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042 has been
corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Database is mandatory on UserMailbox.
WARNING: Database is mandatory on UserMailbox.

However, when I run...

Get-Mailbox |fl name, alias

I do not get any errors.

I tried just running...

Get-mailbox -arbitration

I get...

Name                      Alias                ServerName       ProhibitSendQuota
----                      -----                ----------       -----------------
SystemMailbox{1f05a927... SystemMailbox{1f0... theta            Unlimited
WARNING: The object swcc.local/MyBusiness/Users/SBSUsers/SystemMailbox{1f05a927-cb59-4d68-8b38-1c63ed6f0c67} has been
corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Database is mandatory on UserMailbox.
WARNING: Database is mandatory on UserMailbox.
SystemMailbox{bb558c35... SystemMailbox{bb5... theta            Unlimited
WARNING: The object swcc.local/MyBusiness/Users/SBSUsers/SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c} has been
corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Database is mandatory on UserMailbox.
WARNING: Database is mandatory on UserMailbox.
SystemMailbox{e0dc1c29... SystemMailbox{e0d... theta            Unlimited
WARNING: The object swcc.local/MyBusiness/Users/SBSUsers/SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9} has been
corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Database is mandatory on UserMailbox.
WARNING: Database is mandatory on UserMailbox.
Migration.8f3e7716-201... Migration.8f3e771... theta            300 MB (314,572,800 bytes)
WARNING: The object swcc.local/MyBusiness/Users/SBSUsers/Migration.8f3e7716-2011-43e4-96b1-aba62d229136 has been
corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Database is mandatory on UserMailbox.
WARNING: Database is mandatory on UserMailbox.
FederatedEmail.4c1f4d8... FederatedEmail.4c... theta            1 MB (1,048,576 bytes)
WARNING: The object swcc.local/MyBusiness/Users/SBSUsers/FederatedEmail.4c1f4d8b-8179-4148-93bf-00a95fa1e042 has been
corrupted, and it's in an inconsistent state. The following validation errors happened:
WARNING: Database is mandatory on UserMailbox.
WARNING: Database is mandatory on UserMailbox.

Server "Theta" is a failed install of an Exchange server. I was unable to uninstall or do the whole restore install, so I removed it from ADSI. However, it is still apparently somewhere in my system.

Could this be the problem? How do I get rid of this server?

Okay, I went ahead and deleted all the above referenced mailboxes from the failed servers. Now running any of those commands does not return any errors.

However, when I now go to migration in the ECP, i get the message...

The migration mailbox for the organization is either missing or invalid.

I reran both preparead and prepareschema and that did not fix it.

Any ideas?

Google is my friend, Google is my friend...

http://support.microsoft.com/kb/2812509/en-us

Since I had already run PrepareAD, I just ran these two cmdlets...

Enable-Mailbox -Arbitration -Identity "Migration.8f3e7716-2011-43e4-96b1-aba62d229136"

Set-Mailbox "Migration.8f3e7716-2011-43e4-96b1-aba62d229136" -Arbitration Management:$true

Seems to be good now!