Presumably you are running Windows 2000 or XP - Under NT-based systems, to
print to a custom size,
you must select a printer form, which specifies the paper size. To view the
different forms that are available on your system, open the Printers window,
and click Server Properties on the File menu. You will have to create your
custom size here.
Alternatively simply use the nearest larger standard size and set the
margins to allow printing within the confines that your smaller envelope
allows.
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Graham Mayor - Word MVP