How to: Print envelopes when using MailMerge.
Solution:
Select 'Envelopes and Labels...' from the 'Tools' menu and complete the address boxes. Then choose 'Print'.
1) Select the 'Tools' menu and select 'Envelopes and Labels...'. (The Envelopes and Labels dialog box appears.)
2) Complete the 'Delivery Address' box.
3) Complete the 'Return Address' box.
4) Click 'Print'.