lookup a text cell and return text

Hi Guys,

I need your help, and I hope I'll make myself clear. So, I have to
workshhets. In sheet A there is a database, and one of the columns consists
of different email addresses. In sheet B, there is another database, and one
of the columns is again containing email addresses. Some of them match with
the column from sheet A. Now on sheet 2, to each email address corresponds a
certain PIN number. What I want to do is: search if each of the email
addresses from Sheet A is found on sheet B, and if it is, then I want to
return in a cell the PIN number corresponding to it.

sheet A sheet B

a@a.com m@m.com 434
b@b.com r@r.com 545
c@c.com b@b.com 655
d@d.com a@a.com 434

So, in the above example, I need to see if a@a.com appears in the column
from sheet B, and then to return the # 434 in a cell next to the entry from
sheet A.

I hope I made myself clear enough. Help please!

INDEX and MATCH works

INDEX(<Insert Range of PIN Numbers from Sheet B>,MATCH(<insert Email Address from Sheet A,<insert Range of Email Addresses from Sheet B>,0),0)

Make sure that the ranges selected for PIN Numbers and Email Addresses are equivalent (i.e. rows 1-100 for both, not rows 1-50 for one and 1-400 for the other), else you can end up with errors.