I cannot open outlook on my window PC

claudine durassier 0 Reputation points
2026-11-12T18:47:48.4933333+00:00

Outlook will not open at all on my PC, I can get it on my phone but there I can't access mails prior to 14 October.

Outlook | Windows | Classic Outlook for Windows | For home
0 comments

2 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Jose Benjamin Solis Nolasco 13,371 Reputation points Volunteer Moderator
    2026-11-12T19:03:46.7833333+00:00

    Welcome to Microsoft Q&A!

    Hello,

    What you are experiencing is currently linked to an active Microsoft 365 service incident tracked under ID EX1550543.

    Microsoft initially reported intermittent connectivity issues affecting Exchange Online mailboxes in the Americas, and has since updated the advisory to confirm that the issue may impact general Microsoft 365 service connectivity across any region.

    What this means for your environment:

    • Affected Services: Primarily Exchange Online / Outlook (desktop client, Outlook on the web, and mobile apps), along with potential authentication or connection timeouts across broader Microsoft 365 services (such as Teams, SharePoint/OneDrive, or the Microsoft 365 Admin Center) that rely on shared front-end connectivity infrastructure.

    Action Required: No configuration changes are needed on your tenant or client devices. Microsoft engineering teams are actively working on mitigation.

    How to track live status:

    Open the Microsoft 365 Admin Center using a Global Admin or Service Support Admin account.

    Navigate to Health > Service health.

    Search for incident ID EX1550543 for real-time mitigation progress and root cause updates.(You can also follow official updates via @MSFT365Status on X).

    Help make this community better for everyone: if this answer resolved your issue, please accept it or leave an upvote. If not, share more details in a comment so we can continue the discussion and find the right solution.

    Was this answer helpful?

    0 comments

  2. AI answer

    2026-11-12T18:48:04.4233333+00:00

    Try these steps in order for classic Outlook on Windows:

    1. Start Outlook in Safe Mode.
      • Press Windows key + R.
      • Type Outlook /safe and select OK.
      • In Choose Profile, accept the default and select OK.
      • If Outlook opens, the issue is likely an add-in.
    2. If Safe Mode works, disable add-ins.
      • In Outlook, go to File > Options > Add-ins.
      • At the bottom, confirm Manage shows COM Add-ins, then select Go.
      • Record which add-ins are enabled.
      • Clear all selected check boxes, then select OK.
      • Close Outlook.
      • Start Outlook normally.
      • If it opens, re-enable add-ins one at a time until the problem returns.
      • Do not use Remove. Disable the add-in only.
    3. Reset the Navigation Pane.
      • Close Outlook.
      • Press Windows key + R.
      • Type Outlook.exe /resetnavpane and select OK.
      • This removes Navigation Pane customizations.
    4. Create a new Outlook profile.
      • A corrupted profile can prevent Outlook from opening.
      • Use the steps in Create an Outlook profile, then restart Outlook and select the new profile in Choose Profile.
      • If Outlook opens with the new profile, the old profile was corrupted.
      • Warning: if removing an old profile, back up data files first. Removing a profile deletes offline cached content.
    5. Repair Outlook data files.
      • Exit Outlook.
      • Run the Inbox Repair Tool by following Repair Outlook Data Files (.pst and .ost).
    6. If Outlook is stuck at loading profile or still will not start after an update:
      • Open Task Manager.
      • End all Office processes.
      • Start Outlook again.
      • If the issue began with Current Channel Version 1905 (Build 11629.20196) or later, restarting Outlook a couple of times can allow it to pick up the service fix.
    7. Make sure Office is updated.
      • Open any Office app such as Word.
      • Go to File > Account.
      • Under Product Information, select Update Options > Update Now.

    Since Outlook opens on the phone but older mail is missing there, use the Windows Outlook troubleshooting above first so the full mailbox can be accessed again on the PC.

    AI-generated content may be incorrect. Read our transparency notes for more information.

    Was this answer helpful?

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.