Get your backup handsets ready people, unless everything goes perfectly there’s a good chance that BlackBerry service is going to be down when you wake up tomorrow morning. The outage is scheduled for 2:00am – 6:00am tomorrow morning but these things rarely go as planned. Highlights from the note:

Description: Database upgrade for all North American subscribers in the following locations: The Americas

Change Window Start Date and Time: 03/22/08 06:00:00 (GMT) Change Window End Date and Time: 03/22/08 10:00:00 (GMT) Downtime Duration: 4 hour(s) and 0 minute(s)

Impact: BlackBerry subscribers may be unable to send or receive messages during the maintenance.

Subscribers may also be unable to register their device, roam in another location, or use other services such as Internet browsing.

BlackBerry Internet Service subscribers may be unable to use the BlackBerry Internet Service web site or perform activities such as creating new accounts, accessing their Internet mailbox, integrating third-party email accounts, or viewing email attachments during the maintenance.

BlackBerry Enterprise Servers may be unable to connect to the BlackBerry Infrastructure during the maintenance.

Hit the read link for the full announcement, and make sure you charge your backup before you hit the sack tonight…

[Thanks Justin]

UPDATE: That’s Saturday morning, not tomorrow morning. Thanks james