Just received this from Rogers:

The Rogers Enterprise Service Centre has been advised of the following planned (I think they meant to say 'unplanned') maintenance activity

Notification Type: Unplanned (New)
Service Affected: Blackberry PIN-to-PIN / Email messages
Area Affected: National
Date: Monday, March 08, 2010
Start Time: 2:30 PM (EST)
End Date: TBD
End Time: TBD
Estimated Outage Length: TBD

Work Summary: BlackBerry subscribers may intermittently experience delays in sending and receiving PIN and Email messages and may receive an "x" when sending PIN and Email messages. Enterprise Activation may also fail. RIM and Rogers is currently investigating and this message will be updated when more information becomes available.