Zend certified PHP/Magento developer

One Outlook mailbox will not sync

Overview

I have a user with 3x Office 365 mailboxes. I’ve found that 2/3 inboxes are syncing fine, the last one will not sync. We’ll call the last inbox last-inbox@example.com.

UX

Mailbox last-inbox@example.com is showing up in Outlook. It just has no emails in the Inbox or Sent Items. Nothing we do allows the inbox to sync down. The user can however get access to the inbox from https://outlook.office.com.

Troubleshooting done so far

Below is the troubleshooting we’ve done so far:

  1. Confirmed that the user can access last-inbox@example.com via OWA.
  2. Deleted and recreated the user’s Outlook profile.
  3. Tried adding last-inbox@example.com under Account Settings > Add Mailbox.