Missing Exchange contacts on iPhone

Enable contact synchronization for the Exchange account in iPhone settings, then use Outlook on the web to determine whether the contacts remain in the mailbox or require recovery.

1. Restore Exchange contact synchronization

For Apple’s built-in Mail/Contacts apps:

1. Open Settings → Apps → Mail → Mail Accounts.
2. Select the Exchange/Microsoft 365 account.
3. Turn Contacts on.
4. Open the iPhone Contacts app, select Lists, and ensure the Exchange contact list is selected.
5. Allow several minutes for synchronization.

Microsoft identifies the Contacts account switch as the first check when Exchange contacts stop appearing in iOS. ^1^

If contacts are displayed through the Outlook app instead:

1. Open Settings → Apps → Outlook → Contacts.
2. Set access to Full Access.
3. Enable Background App Refresh.
4. In Outlook, open Settings → Accounts → your Exchange account and select Reset Account if it is available. ^1^

2. Verify whether the contacts still exist in Exchange

Sign in to Outlook on the web with the same Exchange Online account and open People:

• Contacts appear there: The mailbox data is intact, and this is an iPhone synchronization/configuration issue. If enabling Contacts did not restore them, delete and re-add the account:
  1. Go to Settings → Apps → Mail → Mail Accounts → Exchange account.
  2. Select Delete Account.
  3. Return to Mail Accounts → Add Account and choose Microsoft Exchange—not IMAP or POP.
  4. Sign in and enable Contacts.
  Confirm the contacts exist in Outlook on the web before removing the iPhone account. IMAP and POP synchronize email only, not Exchange contacts or calendars. ^2^
• Contacts are also absent there: Check the Exchange deleted-contact locations before changing the iPhone account.

3. Recover contacts missing from the mailbox

In Outlook on the web:

1. Open People → Deleted.
2. Select the missing contacts, right-click, and choose Restore.
3. If they are not there, remain in People → Deleted, select Recover deleted, choose the contacts, and select Restore.
4. Also check Mail → Deleted Items for contact items and restore any found there.

Recovered contacts return to their original folder when possible; otherwise, they return to the default Contacts folder. ^3^

Exchange Online retains deleted mailbox items for 14 days by default, although an administrator can configure up to 30 days. Recovery is possible only while the item remains within the applicable retention period. ^4^

If Recover deleted is unavailable or the contacts are no longer listed, contact the Microsoft 365/Exchange administrator promptly. Provide:

• The mailbox address
• The approximate date the contacts disappeared
• Confirmation that People → Deleted and Recover deleted were checked
• Whether the contacts still appear in another Outlook client or device

The administrator can investigate recovery while the mailbox’s retention or hold settings still permit it.

References

1. [iOS Mail](https://support.microsoft.com/outlook/can-t-sync-calendar-and-contacts-with-my-phone-or-tablet)
2. Troubleshoot Outlook mobile issues | Microsoft Support
3. [Web](https://support.microsoft.com/outlook/people/restore-or-recover-a-deleted-contact-in-outlook)
4. Microsoft 365 Exchange data deletion