There's an article on the Microsoft web site that might help you:

Answer Box: Numbers don't merge right in Word
http://office.microsoft.com/en-ca/as...164951033.aspx


Durham wrote:
I have a name/address document set up in Excel and when I try to do a mail
merge for address labels into Word, the addresses that have the extended,
9-digit zip code won't print the zip code. All that prints is a "0". Anyone
else have this problem or know a solution?


--
Debra Dalgleish
Excel FAQ, Tips & Book List
http://www.contextures.com/tiptech.html