I saw a tweet from Data Outages that a scheduled maintenance will interrupt BlackBerry service to Rogers customers on 01-17-10. Details:

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.


At least with these planned outages, most of us sleep through them and often times would never even know there was one if we hadn't read about it on a blog