Posted here, sourced here, and confirmed here (who has apparently confirmed with RIM), it looks like North American BlackBerry BIS and BES users may experience some BlackBerry service interruptions on March 22nd, between 12:00am - 4:00am CST as RIM works on database upgrades.
I like knowing these things. Most of us will be sleeping at this time anyways, so no biggie, but I always think having more information is better than not having any. It would be sweet if RIM just put a "Bulletin" page up on their site, which users could subscribe too. It would make getting this kind of information out there so easy, and would save on a lot of end-user frustration (and battery pulls). Full details after the jump.
RIM "Scheduled" Outage for March 22nd
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.
Devices may not receive new service books during the maintenance.
BlackBerry Connect and BlackBerry-enabled devices that require a new PIN may be unable to receive the PIN.
BlackBerry Enterprise Servers may be unable to connect to the BlackBerry Infrastructure during the maintenance.
Wireless service providers and device resellers may be unable to use BlackBerry administration web sites or perform activities such as creating subscriber accounts or provisioning services for subscribers during the maintenance.