How to access Office 365 Shared Mailbox (Calendar) on iOS

Client has Office 365 E3. Has a handful of users. They have a Shared Mailbox where they all access and use the Calendar.

Now, they need to be able to access that Shared Mailbox Calendar on iOS. I'm aware that MS does not want people to do this but there is a workaround:
  1. Add Account
  2. Other
  3. Add Mail Account
  4. Name: Name of shared mailbox
  5. Email: email address of shared mailbox
  6. Password: of user who has full access to shared mailbox
  7. Description: Name of the shared mailbox
  8. NEXT
  9. IMAP
  10. Incoming Mail Server:
  11. Username: (your_primary_account)@domain\enter_the_name_of_the_shared_mailbox
  12. Password: of user who has full access to shared mailbox
  13. Outgoing Mail Server
  14. SMTP:
  15. Username: email address of the person who has full access to the shared mailbox
  16. Password: of user who has full access to shared mailbox
I can confirm this works fine as I have just added a Shared Mailbox from my own Tenant onto my iPhone.

However, once the account is Verified the only mailbox items I can sync are:
  • Mail
  • Notes
No Calendar :-(

Besides converting the Shared Mailbox to a full mailbox, is there any other way?

LVL 13
Mark GalvinManaging Director / Principal ConsultantAsked:
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timgreen7077Exchange EngineerCommented:
The method you mentioned is correct, apart from enabling the shared mailbox user object there is no other way to add shared mailbox to a mobile device. The method you performed via IMAP are the only option available at this time.
Vasil Michev (MVP)Commented:
The latest version of the Outlook app for iOS/Android supports accessing shared Calendars, I have covered it here:

Now if you want access to folders other than the Calendar, you have to wait for future versions.

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