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Our SBS2003 is basically only managing user IDs (aka Active Directory). Files shares are on a NAS and mail is to soon be on Google Apps.

Can I replace SBS2003 with a MountainLion Mac Mini Server to manage Windows XP desktop logins?

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Do you want to migrate existing usernames to Mac Mini Server? Do your file shares use permissions based on your AD usernames? – Gilby Mar 4 '13 at 3:17

Yes, in OSX 10.8 Server the alternative to AD is called Open Directory. There's a fantastic resource here;

You'll want to read up on the Manage Users section, but in short you can import all of your data from AD into Open Directory so that both Macs and PCs can authenticate against your OSX Server. As you already have a NAS you can also store all user directories there too (home folders / my documents).

Its an involved task to do this, so its probably too long to answer here, but that resource from Apple gives you everything you need to know.

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Can you show us where the Manage Users section explains how to import users from AD to Open Directory? – Gilby Mar 4 '13 at 3:24
Here;… and if you get stuck, here;… - hope that helps? – sgtbeano Mar 4 '13 at 9:51

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