Share via

Mobile Device outlook App issue

kamal uddin 0 Reputation points
2026-04-15T06:04:38.95+00:00

We are currently facing an issue with mobile devices using the Outlook app connected to Exchange Server 2019. Users are able to successfully configure their accounts, and new emails are sending and receiving without any problem. However, older emails are not downloading or appearing in the Outlook mobile app.

This issue is affecting both Android and iPhone devices, and it is occurring for multiple users across the environment. While the Outlook Web App (OWA) is working correctly and displays all emails (including older messages), the mobile Outlook app only shows recent emails.

It appears that synchronization is partially working, but historical emails are not being retrieved or displayed on mobile devices. Further investigation is needed to identify whether this is related to synchronization settings, mailbox policies, server configuration, or any limitations within the Outlook mobile app.

Exchange | Exchange Server | Management
Exchange | Exchange Server | Management

The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.

0 comments

1 answer

Sort by: Most helpful
Most helpful Newest Oldest
  1. Dora-T 13,060 Reputation points Microsoft External Staff Moderator
    2026-04-15T08:04:35.33+00:00

    Hi kamal uddin

    To help narrow down the scope of the issue, could you please confirm the date range of emails that are currently syncing to the Outlook mobile app?

    From my findings, Outlook mobile does not access mailboxes in the same way as Outlook desktop or OWA. Even with Exchange Server 2019, Outlook for iOS and Android relies on Exchange ActiveSync together with Microsoft’s cloud-based service, which may retrieve only recent mailbox items for performance and reliability reasons.

    This behavior has been observed in other Exchange Server 2019 environments and does not necessarily indicate mailbox corruption or a server-side issue.

    As a next step, please verify the following:

    -Whether any mail age or filtering limits are defined as part of the Exchange ActiveSync mailbox policy. You can review the current configuration by running:

    Get-MobileDeviceMailboxPolicy | Format-Table Name,MaxEmailAgeFilter

    If the default policy is not set to All, you can update it to remove the mail age restriction by running:

    Set-MobileDeviceMailboxPolicy -Identity "Default" -MaxEmailAgeFilter All

    References:

    -Test the mailbox using the device’s native mobile mail application.

    -Confirm that ActiveSync, Autodiscover, and related Exchange services are functioning as expected.

    Reference: Using hybrid Modern Authentication with Outlook for iOS and Android | Microsoft Learn

    Please understand that our initial reply may not always immediately resolve the issue. However, with your help and more detailed information, we can work together to find a solution.  

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.