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


Debbie Love wrote:
I am trying to do a mail merge using an excel data source of addresses. The
zip codes appear with zeroes in the data source, but when I merge them to MS
Word, the zeroes are dropped. How do I fix this problem?


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