When you try to receive mail in Microsoft Outlook 2007, you receive the following error:

Receiving reported error 0x8004210e your mailbox is temporarily unavailable because another email message is being delivered to it or another mail application is accessing it.

This can be fixed by repairing the Outlook email account. To do this:

1. Click Tools, then Account Settings.
2. Click on the email account to highlight it (like pop3.vcn.com).
3. Click Repair.
4. Click Next until you see Finish.
5. Click Finish.