There's a 255 character limit. There may be a way around it by shecking the
"Confirm conversions at open" box in Tools>Options>General and then when
attaching the data source to the mailmerge main documnet, selecting DDE as
the method of connection.

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
> How large of a field can be merged in a mail merge document? I am merging
> from an Excel file and sometimes the amount of data is clipped off when
> merged in the merged document.