After reverting to previous version of a document and then closing the window, this dialog may appear: The document “file name” is on a volume that does not support permanent version storage. You may not be able to access earlier versions of the document once you close it....

Learn how to share files that reside on a disk image (.dmg)....

Users who are being managed with Parental Controls are prevented from using Dictation, but it can be enabled easily....

After upgrading to Mountain Lion: Your Exchange email account may not connect in Mail. You may receive an error message when attempting to send or receive messages. Your settings appear to change each time you quit and open Mail....

Learn how to reset (flush) the DNS cache....

After upgrading to OS X Server (Mountain Lion), when selecting an AirPort base station in Server.app, this alert may appear and you may be unable to administer the base station: "An error occurred on the server while processing a command. The error occurred while processing a command of type 'getIGDPortmaps' in plug-in 'servermgr_network'"...

NetBoot services appear to be available on the server, but one or more client computers cannot start up from the server....

by Ted Landau, Macworld.com

If no administrator is logged into the server running OS X Server (Mountain Lion), shared folders on external storage will not be available to users over any sharing protocol such as AFP or SMB. If clients have a share mounted that is on an external drive when the administrator logs out, the connection to the share will be lost....

Learn about the fonts included with OS X Mountain Lion....