MailMerge365 logo MailMerge365

Welcome!

MailMerge365 is an add-in for Microsoft 365 and Outlook. In order to use it please login with your Microsoft 365 account using the button below.

If you have not signed-up yet an account will be automatically created and linked to the account you're logging in with.

Recent changes

• Workaround for a Microsoft bug when uploading spreadsheets 2026 - Update Nr. 9

Microsoft's Edge runtime 157 blocks file pickers in Outlook for Windows, so you pick files in an extra window. We'll remove this step once Microsoft fixes it.

Read more
• Clearer messages for two start-up problems 2026 - Update Nr. 8

When Outlook will not let you save a draft in a shared or delegated mailbox, or when the request to open a sign-in window is dismissed, the add-in now says what happened and what to do about it instead of showing a general error.

Read more
• Fewer password prompts when signing in 2026 - Update Nr. 7

When Outlook returns an expired sign-in, the add-in now signs you in again using your existing Microsoft session instead of asking for your password every time.

Read more
See full change log...
Go to help page
  • Help
  • Terms of Service
  • Imprint
  • Privacy Policy
Made with ❤ all around the world by Sol Inventum OÜ.