I suspect that to see the the Job title field, you will need to initiate the
merge a different way - open Outlook, open the contacts folder you want to
merge from, select Outlook Tools|Mail Merge... and take it from there.
Notice that other outlook fields also become available and the field names
may not be quite the same as the ones you were using before.

[My guess is that you are using Outlook to get your contact data and that
you are using the Word Mail Merge Wizard to specify Outlook as the data
source. If so, Job Title is not actually available as a field in the data
source (even if it appears to be available, you are probably looking at a
list of "Address fields", which is a list of fields Word /might/ find in an
address list, rather than the list of "Database fields", which is what Word
is actually getting from the data source. Also, the field named "Title" is
the "Courtesy Title", not the "Job Title".]

--
Peter Jamieson - Word MVP
Word MVP web site http://word.mvps.org/

Job Title but only Address Line 2 shows up in the merge.