One or more of the following causes may have caused this error:
The desktop redirector is configured to use your internal email address
The Microsoft Outlook mailbox is configured for POP3
Microsoft Exchange Server is unavailable
The personal folder (.pst) or offline folder (.ost) is corrupt
The user account has not been added to the BlackBerry Enterprise Server
Email messages are being flagged as potential viruses
Prefix [Scanned] is being added to the subject line of email messages
A rule is moving messages from
A MAPI profile is missing or corrupt
New mail is forwarded to a .pst file
The firewall does not allow Simple Mail Transfer Protocol (SMTP) connections
The user account is on a “front-end” Exchange server