I was given two files from an old DOS pos system to make a current mailing list with. The first file is a list of all the customers from this company(full list), the 2nd is all the customers active within the previous year(active list). I don't have any access to any information other than what is on the 2 lists I was given and I need to use the active list to make sure that only the current customers get sent anything. Not normally a big issue, if it weren't how these lists were formatted when given to me. The full list is a mailing list that was formatted to run labels from a dot matrix printer and imports to excel in the following manner,

John & Jane Doe
1234 NE Road St
Someplace, OR 97056

The active list is formatted like:

Doe | John & Jane

Because there is no address information on the active list I can't just generate a full mailing list. I am able to seperate the values from the full list by referencing cells onto another worksheet (it seperates as 'name' 'address' 'city/state/zip') but I need to find a true/false formula, or something similar, that will tell me which names on the full list are also on the active list. I can do it the other way around, and check to see which names from the active list are on the full list (all of them) but because of how the values are seperated on each worksheet I can't seem to figure out how to make this work. All help will be greatly appreciated.