Anything from about 700 up.  You can actually find the numbers to figure out how much larger you can expect it to get based on the fields you use.  If you don't use any, or don't have any addresses, etc, then it's very small bump.  If you do have a lot of Exchange data that you intend to populate, lots of PF's that are mail-enabled, lots of mail enabled groups, distribution groups, etc., then it could larger. 
 
Generally speaking, if your DIT drive is low on space, I think you should consider newer drives that come in increments of at least 36GB (if you can find them these days).  If it's the backups you're concerned about, then again, even a double of that size should not make or break you.  You should have a little more than 600 MB buffer for a backup or a disk drive on a DC IMHO.
 
Al

 
On 7/27/06, RM <[EMAIL PROTECTED]> wrote:

NTDS.DIT is currently 650megs.  Once Exchange has been fully deployed, any guesses as to how much larger it will become?  Just looking for a ballpark figure...

thx,

RM


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