User accounts disappeared from Mac Server

My company uses a Mac Server OS X v10.7.5 which we store all our files on and staff connect to it using a mapped drive (B:). This afternoon we stopped being able to connect, we rebooted the server like we normally do, however, when it came back online all of the user accounts have disappeared leaving only our admin account!
All of our files and folders are still there, it's just the user accounts used for accessing these folders that seem to have disappeared.
Coincidently, the + sign under the Users section is greyed out in server.app so I'm having to use Workgroup Manager to add new users. I've tried doing this for myself and given my user account access to the folders that I need however, when I try to map the B: it doesn't recognise my server credentials any more.
Basically, at the moment, no one can access any files or folders so I'm really hoping that someone has an answer on how to either restore the missing user accounts (if that's possible) or how to set up the user accounts so that we can access the files again.
Thanks in advance for any help.

From what I found out it was to do with corrupted Open Directory file, if you've previously archived the Open Directory (through Server Admin) you can restore a previous version or, as we had to do, copied all the server files to an external hard drive and restore from Time Machine, we did it for a point a week ago when it was working and all the user profiles came back.
If you don't already know how to do that, restart the server but hold down the cmd and R (command key and R key) at the same time until it gives you a screen with a list of restore options, select Restore from Time Machine Backup and select a date from a few days ago or whenever you knew it was working fine, depending on the size of the files on your server it can take a couple of hours to do this. Then copy the files from the hard drive back on to the server so youy have the latest versions again.
After it had done this all the user profiles were restored with passwords and groups etc..., if you do remove and restore the files then you may need to re-do any file access permissions but other than that it should be back to how it was before.
Hope this helps and I've explained the process ok.

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