I received that maintenance notification from Rogers this afternoon:
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The Rogers Enterprise Service Centre has been advised of the following planned maintenance activity

Notification Type: Planned (New)

Service Affected: GPRS/EDGE/HSDPA Blackberry/Blackberry Enterprise Server

Area Affected: National

Date: Sunday, January 17th, 2010
Start Time: 02:00 AM (EDT)
End Time: 06:00 AM (EDT)
Estimated Outage Length: 10 minutes

Work Summary: Rogers customer with Blackberry devices may be unable to send or receive messages during the maintenance. They may also be unable to register their device, roam in another location, or use other services such as Internet browsing. At the same time, BlackBerry Enterprise Servers may be unable to connect to the BlackBerry Infrastructure during this maintenance.