Create and print a single envelope - Microsoft Support
https://support.microsoft.com/en-gb/office/create-and-print-a-single-envelope-b766aa84-5b97-4f63-b03f-451d2fb3640f
WEBOn the Mailings tab, in the Create group, click Envelopes. Click Options, and then click the Envelope Options tab. In the Envelope size box, click the choice that matches the size of your envelope. If none of the choices matches your envelope size, scroll to the bottom of the list, click Custom size, and then type the dimensions of your ...
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