Is there a way of deleting the contentsof a mailbox. I'm presuming there must be a PowerShell command you can use.I have a mailbox that's used to receive alerts. It would be useful to be able to clear this down using a single PowerShell command.

You can use the export-mailbox cmdlet. It has an option to -DeleteContent when you export it. You can even set start dates, and other limitations.http://technet.microsoft.com/en-us/library/aa998579.aspx