As you say the data source is an mdb file, I assume that it is a table in an
Access database. If that is the case, Access has a perfectly satisfactory
Label Report Wizard that you could use.
However, did you perhaps change the mail merge main document type from a
label to a formletter or catalog?

Signature
Hope this helps.
Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.
Doug Robbins - Word MVP
>I have created the letters for my mass mailing using MS Word 97 and have
>the
[quoted text clipped - 3 lines]
> "update Labels" button is greyed out on the task bar and I cannot get the
> rest of the addresses pulled in.