Apple has released Server Admin Tools 10.7 to provide compatibility with Mac OS X 10.7 Lion Server. Included are updated versions of Podcast Composer, Server Admin, Server Monitor, System Image Utility, Workgroup Manager, and Xgrid Admin. (Free, 193.25 MB)
File Email with a Key in Apple Mail
In Mac OS X 10.4 Tiger or later, you can use the simple and fun MsgFiler Mail plug-in to file Mail messages using keyboard shortcuts.
New in Apple Mail 4 (the 10.6 Snow Leopard version), to assign a keyboard shortcut to any mailbox on the Move To or Copy To submenu, you can also open the Keyboard pane of System Preferences, click Keyboard Shortcuts, and select Application Shortcuts in the list on the left. Click the + button, choose Mail from the Application pop-up menu, type the name of the mailbox in the Menu Title field, click in the Keyboard Shortcut field, and press the keystroke combination you want to use. Then click Add.
Server Admin Tools 10.7
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I regularly use either Server-Admin and Workgroup Manager to manage my servers. One of them still being 10.5 Leopard.
Server-Admin works fine with Leopard Server, however Workgroup Manager cannot attach to Open Directory on Leopard Server. So you cant administer a Leopard Server with a computer running Lion. Hint: Use Screen Sharing and a local instance of Workgroup Manager on the server.
Even worse, although not able to connect, simply trying to connect leaves the LDAP Database in a state not writeable. Users can still authenticate, but you cant apply changes. The LDAP Database went back to operational by the next reboot. If this does not work for you, you should become familiar with db_recover which did the trick for me whenever something went wrong with Open Directory.
There is no notice regarding system requirements on the Apple site which I regard being a poor job.
Honestly, I'm not getting warm fuzzy feelings about Lion Server from what I'm seeing online. I'd approach any Lion Server upgrade very cautiously.