Hey ppl, me again

I had a look through these forums, but couldn't find anything that helped.
I have a new SME box up and running, running 6.0 Final.
Now, I have about 300-350 users to add.....
I tried the LAT and they didn't work, it says it added the user, but none of the users appeared in the "Users" group under the server manager.....
Can someone plz help me??
I need this ASAP.
Thanks again
Finchwizard
Or if there is some other way of doing this??? It would be great.
Thanks