In addition to older exchange versions it’s relatively easy to export an complete mailbox to a .pst file.
Just open the Exchange management shell and type in:
New-MailboxExportRequest -Mailbox ACCOUNTNAME -FilePath “\\localhost\c$\Export\filename.pst”
The command will now get executed, go to the location you defined and check when the .pst stops growing in size.
The export is now done!
Update:
To view the status of your export request you can type:
Get-MailboxExportRequest
Update #2:
If you get errors when trying to export you might want to enter this:
New-ManagementRoleAssignment -Name “Import Export_Enterprise Support” -SecurityGroup “Enterprise Support” -Role “Mailbox Import Export”
Update #3:
If the .PST export is going slow you have to install SP3 of Exchange 2010!