
Something here may help.
https://support.microsoft.com/en-us/office/use-mail-merge-for-bulk-email-letters-labels-and-envelopes-f488ed5b-b849-4c11-9cff-932c49474705
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I just downloaded Microsoft Office 365. I typed a business letter. But I need to know how to print an envelope. Help says to go to the Mail Merger Tab. I had this tab in Office 2010, but I can't find it in Office 365.
I see it under the ribbon
Go to Mailings > Start Mail Merge > Step-by-Step Mail Merge Wizard.
What do you see on the ribbon? Note that if the Mailings tab isn't available, you probably haven't installed the correct version of Office. You install the full version via the account that is associated with your subscription; go to https://www.office.com/myaccount.
If nothing else, you can create and use an envelope template.
The tab you are looking for is the Mailings tab and it is not available in the Online version. I'm not sure about the mobile versions. It is available on the Mac and PC desktop versions.