Next weekend, March 20, 2010, Salesforce NA1 will be down for an extended (8-hour) maintenance window - the longest in memory - from 7pm 3/20 to 3am 3/21 (All times PST).
Overlapping this is another 8-hour window for NA0 (SSL) starting two hours earlier.
Also starting at 7pm PST, EU0 (EMEA) will be down for 2.5 hours.
All other instances will be down for 30 minutes, from 9pm PST.
As the email from salesforce.com explains:
Dear Salesforce Administrator,
At salesforce.com, customer success through system availability and reliability is our top priority. As part of our ongoing plan to deliver high availability and reliability, we are enhancing our service infrastructure on our NA1 instance.
Please be aware that salesforce.com will be performing scheduled maintenance that will extend beyond standard system
maintenance windows. The current scheduled window is:
Saturday, March 20th, 2010 from 7:00pm PST to Sunday, March 21st at 3:00am PSTDuring this time, the salesforce.com NA1 service will be unavailable. Users attempting to access the service during this time will be presented with a scheduled maintenance notification page.
We appreciate your patience during this maintenance window.
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