Apologies for the short notice, but we'll be taking the Campaign Monitor application offline for a total of 8 hours between 8.30pm this Saturday night and 4.30am Sunday morning (US Central time - see this in your own time zone) to make some key hardware upgrades and add some additional layers of redundancy to both Campaign Monitor and MailBuild.
Don't worry, the maintenance will have zero impact on your subscribe forms or campaign tracking, everything will purr along as usual - you just won't be able to log into your account. If you've scheduled any campaigns to be delivered in this time-frame, they'll be sent as soon as the application is back online.
Update: The updates have been completed successfully and as of 12.30am we're back online. Thanks for your patience everyone.