Is does not seem to work. I pasted both formulas and the entire group shows
up as dormant. If it helps, both are email address. Thanks again.

"Trevor Shuttleworth" wrote:

One way:

=IF(ISNA(VLOOKUP(A1,C:C,1,FALSE)),"Dormant","")

or:

=IF(COUNTIF(C:C,A1)=0,"Dormant","")

Regards

Trevor


"wagz" wrote in message
...
I have a list of all the users in a certain system in column "A". I have a
list of users that have logged in that same system in the past three
months
in column "C". I would like to compare the two columns and have a
function
tell me who has not logged in, in the past three months. So basically,
if
you don't match between a and c you are going to be deleted. Thanks in
advance!