Error: The specified mailbox database [Mailbox Database Name] does not exist, when you try to export mailbox in Exchange 2007

Question

[Symptom]
======================
In Exchange 2007, when you want to export mailbox to a .pst file, you should run the
Export-Mailbox cmdlet from a 32-bit computer that has the following installed:
The 32-bit version of the Exchange management tools
Microsoft Office Outlook 2003 SP2 or later versions
If not, you may encounter the following error message:
You check that you have these required installed, but you get the error below when you run Export-Mailbox in EMS.
“The specified mailbox database [Mailbox Database Name] does not exist.”
[Cause Analysis]
=======================================
This is because that the account you use to run Export-Mailbox cmdlet don’t have the Exchange Server Administrator role assigned.
You can check if this account has been delegated the Exchange Server Administrator role through the following path.
EMC -> Organization Configuration-> Check permissions in the result pane.
To delegate this Exchange Server Administrator role, right click on the
Organization Configuration node and choose Add Exchange Administrator,
you will see the Add Exchange Administrator window.
[More Information]
==============================
Export-Mailbox
http://technet.microsoft.com/en-gb/library/aa998579(v=exchg.80).aspx
How to Export and Import mailboxes to PST files in Exchange 2007 SP1
http://blogs.technet.com/b/exchange/archive/2007/04/13/3401913.aspx
Exchange 2007 cannot export pst files via its powershell
http://social.technet.microsoft.com/Forums/forefront/en-US/b3bc0dce-35f3-4a69-9a33-4f2a855b9f94/exchange-2007-cannot-export-pst-files-via-its-powershell?forum=exchangesvrgenerallegacy
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Answer 1

Hi,
Based on my test, if you make the user the owner of the database (rather than a user with the db_owner role), when you create a query, it creates it under the dbo schema rather than DOMAIN\username.
Steps to do so (in Management Studio):
Right click database, select Properties 
Click File 
Change Owner in the textbox 
OK to confirm 
Downside - other users under db_owner role will still have their username appended. So schemas have to be created for these users.
Jaynet Zhang
TechNet Community Support