See "Formatting Word fields with switches" on fellow MVP Graham Mayor's
website at
http://www.gmayor.com/formatting_word_fields.htm
For the calculation problem, you may be able to do the calculation in word
by putting the base mergefields inside an { = } field construction in the
mailmerge main document.
Alternatively, if you check the "Confirm conversions at Open" box under
Tools> Options>General and change the connection method, the calculated data
may appear.

Signature
Please post any further questions or followup to the newsgroups for the
benefit of others who may be interested. Unsolicited questions forwarded
directly to me will only be answered on a paid consulting basis.
Hope this helps
Doug Robbins - Word MVP
> When I merge a word document with an Access database I
> find that the formatting of numeric fields is incorrect.
[quoted text clipped - 5 lines]
> recipients window nor in the merged document. Can anyone
> help?