In this screencast tutorial I cover how to upgrade your server from Lion to Mountain Lion. I walk through the process of getting ready for the upgrade including making sure you keep a copy of your Mountain Lion install so you can use it later to create a USB bootable copy and to use it for Netinstall on your server. Having done the upgrade myself things seem to be pretty stable. There is a known issue with VPN and the interface with managing an Airport Extreme Router. If you get an error message related to your Airport Extreme and/or have problems with VPN, follow the directions on this Apple Support Article: http://support.apple.com/kb/TS4353?viewlocale=en_US&locale=en_US, which basically has you delete your airport password from Keychain Assess and relaunch your Server App. If you have any questions on the upgrade process feel free to leave a comment here or on my Youtube Channel.
