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How do I add a single Microsoft 365 mailbox?

Use this to add mailboxes one at a time. Each mailbox owner gets an email and connects their own mailbox, so you don’t need Microsoft 365 admin access.

To add many mailboxes at once without each owner having to do anything, see How do I bulk add Microsoft 365 mailboxes?

  1. Click Entities in the bottom-left corner.
  2. Go to Mailboxes and click Add a mailbox.
  3. Under What sort of mailbox would you like to add?, choose Individual.
  4. Under Select a type, choose Microsoft (Hotmail, O365, Outlook.com etc).
  5. Leave Would you like to sync out of office calendar events too? unticked, unless you want full-day Out of Office events copied to that person’s leave days.
  6. Enter the Mailbox Name and Email. You can also add a personal message.
  7. Click Send Authentication Email.
  1. They open the email from timetoreply and click Link my mailbox.
  2. They sign in to the Microsoft 365 account being added and accept the permissions.

Refresh the Mailboxes page. A tick appears next to the mailbox once it’s connected.

After about 10 minutes, you’ll see data for the mailbox in the Overview report and in Messages.