Apologies for the short notice, but we'll be taking MailBuild 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 MailBuild and Campaign Monitor.

Don't worry, the maintenance will have zero impact on your client's subscribe forms or campaign tracking, everything will purr along as usual - they just won't be able to log into their account. If your clients schedule any campaigns to be delivered in this time-frame, they'll be sent as soon as the application is back online. We'll display a generic scheduled maintenance page to your clients during this time.

Update: The updates have been completed successfully and as of 12.30am we're back online. Thanks for your patience everyone.