Using iCloud email account under Mac OS X 10.6.x

If you’re like me and use multiple Macs, some on OS X 10.6.x, and some on 10.7.x — and are a MobileMe/iCloud subscriber — you may have noticed that Mail.app stopped working on your 10.6.x machine upon transition to iCloud.  This article by Roger Wilmut will get you going again.