[X-Servers] Importing E-mail Accounts

[Lydia Osborne]

I am using a Mac OSX 10.4.7 server for about 4000 student email 
accounts.  At the beginning of each semester, we import students from 
our ERP system.  Each time we import, the server ignores all attempts to 
force a sequential numbering of accounts and will jump from, say user id 
4171, to 10432 at the next import.  Typically, this would not be an 
issue, but the last import wrapped to negative numbers.  What am I 
missing on the  import?  I have specified the starting ID on the first 
import page, we have included specific entries for UID's and it still 
jumps.  Any ideas would be greatly appreciated.

Thanks!
Lydia Osborne
Weatherford College