In C2 (assume you start from row 2 with labels above?): =COUNTIF($A$2:A2,A2)
copy and paste this down to end of range.
Then to determine how many unqiue ID's in a month: =SUMPRODUCT(--(B1:B100>=#date#),--(B1:B100)<=#date#),--(C1:C100<2))
where #date# is iether the actual date types in, or linked to a cell if you prefer. This formula looks between dates so for one month date1 may be 01/01/06 and date2 will be 31/01/06.
If you want date specific then simply use --(B1:B100=#date#) and take out the other date conditions.
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