Email Sync Problems

How to Fix Outlook Emails Becoming Unread After Restart

Huma Ashraf Ch Sep 29, 2026 869 views

Question details

Users need to resolve an issue where read emails revert to an unread status upon reopening the application.

How to Fix Outlook Emails Becoming Unread After Restart

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Managing emails using a POP account in classic Outlook.
Observed behavior: Emails that are marked as read in the inbox become unread again after the Outlook application is restarted.

Before you start

Verify that your internet connection is stable and ensure you have your POP account credentials (email address and password) handy before modifying account settings.

Solution 1Recommended

Start Outlook in Safe Mode to Test Add-ins

Running Outlook in Safe Mode disables third-party add-ins, helping identify if a conflicting extension is preventing the read status from saving.

Third-party integrations and add-ins can sometimes interfere with Outlook's ability to update local data files. By launching in Safe Mode, you bypass these extensions.

Open the Run dialog

Press the Windows Key + R on your keyboard simultaneously to open the Run window.

Launch Safe Mode

Type 'outlook.exe /safe' into the text box and press Enter or click OK.

Test the read status

Open an unread email so it marks as read, close Outlook, and reopen it normally to see if the status is retained.

Disable problematic add-ins

If the issue is fixed in Safe Mode, go to File > Options > Add-ins in regular Outlook, select 'COM Add-ins', click 'Go', and uncheck add-ins to isolate the culprit.

Start Outlook in Safe Mode to Test Add-ins

Safe Mode Profile Prompt: When opening in Safe Mode, Outlook may ask you to choose a profile. Simply select your default profile and click OK.

Solution 2

Create a New Outlook Profile

A corrupted local Outlook profile can fail to track email states correctly. Creating a new profile forces Outlook to build a fresh configuration.

Solution 3

Install the Latest Outlook Updates

Microsoft frequently releases patches to address known bugs and sync issues in classic Outlook.

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Frequently Asked Questions

Why does this unread email issue happen with a POP account?

Unlike IMAP accounts that constantly sync their read/unread status directly with the email server, POP accounts download emails to a local data file (PST). If the local configuration is corrupted or an add-in interrupts the save process, the local read status is lost upon closing the app.

Will creating a new Outlook profile delete my old emails?

No, creating a new profile simply creates a new configuration. However, for a POP account, you may need to manually import your old PST data file into the new profile via File > Open & Export > Import/Export to view your historical emails.

How do I know which add-in is causing the email read status issue?

If the issue stops in Safe Mode, you can identify the culprit by disabling all COM Add-ins via File > Options > Add-ins, and then re-enabling them one by one. Restart Outlook after enabling each add-in until the problem returns, which will reveal the faulty add-in.

Outlook & Email Problems