Question : How To Bulk Import Marketing List Members in MS CRM 4.0?

Is there a way to add marketing list members using a .csv file containing email addresses?  

I realize I can import new contacts then use the "import log" created to add to an existing marketing list, but how do I handle existing contacts?

We use email addresses to eliminate duplicate contacts

Answer : How To Bulk Import Marketing List Members in MS CRM 4.0?

Update to the VLOOKUP formula. It needs to be something like this:

=VLOOKUP(A2,'Email Address only'!A:B,2)

A2 is the cell immediately to the left and therefore will change for each row, A3, A4 etc.  The second argument: 'Email Address only'!A:B stays the same - it is a reference to the list of e-mails on the first sheet. The third argument stays the same at 2, it says return the content of the cell in the second column (i.e. the GUID) for the e-mail address found in column 1.