If the printer driver offers the A2 envelope as a page size simply create
one. Otherwise use the next larger sized page and adjust the available space
with margins.
You may find http://www.gmayor.com/Alternative_Return_Addresses.htm and
http://www.gmayor.com/Macrobutton.htm useful

Signature
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Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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> I am looking for a template that will fit A2 envelopes having a return
> address on it.