When attempting to open a mailbox through OWA, I received the error:
A problem occurred while trying to use your mailbox. Please contact technical support for your organization.
To resolve this, in Powershell, I ran the command:
Set-Mailbox User_Name -ApplyMandatoryProperties
Source: http://support.microsoft.com/kb/941146
Note: You may receive an error if the mailbox is located outside your current domain.
Set-Mailbox : The operation could not be performed because object ‘User_Name’ could not be found on domain controller ‘fqdn.domain.net‘.
At line:1 char:12
+ Set-Mailbox <<<< User_Name -ApplyMandatoryProperties
To resolve the above, you’ll need to specify a domain controller in the mailbox’s domain on which to target the cmdlet by adding the following to the end of the cmdlet:
-DomainController fqdn.domain.net
So, for example:
Set-Mailbox User_Name -ApplyMandatoryProperties -DomainController fqdn.domain.net
