Just enter the return address under Tools>Options>User Information and then
via the Envelopes and Labels dialog, select the size envelope that you want
to use - there is no need to have the addressee's address on it. On the
assumption that you will need to print multiple envelopes with the return
address, click on the Add to Document button and then in the File Print
dialog enter either 0 (for Page 0) or s1 for Section 1 in the Pages field of
the dialog.

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
>I am using a clear window envelope and want to send out a mass mailing and
> only need to print the return address. I don't see the clear window style
> envelope in the envelope options list.