failing to open

Karen Tidler 0 Reputation points
2026-09-14T00:48:16.65+00:00

About once a week the new Outlook gives me a message "We detected a problem launching the new Outlook.  Please try again later."  When this happens I have no access to calendar items.  What is causing this?  

Outlook | Windows | New Outlook for Windows | For business
0 comments

2 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Elena-VH 1,650 Reputation points Independent Advisor
    2026-09-14T01:05:56.4033333+00:00

    Dear Karen Tidler,

    This issue can be caused by several factors, and the fact that it occurs intermittently (about once a week) suggests the problem may be related to the Outlook application itself. Some common causes include:

    • Corrupted Outlook cache or local app data.
    • Temporary service connectivity issues when Outlook is starting.
    • Conflicts with Windows updates or Outlook updates.

    In the meantime, here are a few troubleshooting steps you can try:

    Step 1: Check whether you can access your mailbox and calendar through Outlook on the web when the issue occurs. If the web version works, the problem is likely specific to the New Outlook app.

    Step 2: Sign out of New Outlook and sign back in.

    Step 3: Repair the New Outlook app:

    Close Outlook > Open Windows Settings > Apps > Installed apps > Find Outlook (new) > Select Advanced options > Choose Repair first, and if the issue continues, Reset

    Note: Make sure Windows and Outlook are fully updated.

    Step 4: Check whether the error appears after waking the computer from sleep, after VPN usage, or after network changes, as these can sometimes affect account authentication.

    However, if the problem persists, to help narrow down the cause, could you let me know:​‌

    • Does the problem occur only in the New Outlook app, or does Outlook on the web show the same behavior?
    • Are other users in your organization experiencing the same issue?
    • If you switch back to classic Outlook (if available), does the same issue occur?
    • Do you receive any additional error details or error codes when the launch failure happens? If possible, could you please provide a screenshot of the error message the next time it occurs?

    If you have any questions or if I have misunderstood anything, please feel free to reach out. I'm looking forward to your update.

    Was this answer helpful?

  2. AI answer

    2026-09-14T00:48:32.1866667+00:00

    The context does not identify a single confirmed root cause for the recurring "We detected a problem launching the new Outlook. Please try again later." message in new Outlook for Windows. The supported causes and patterns are:

    1. Local new Outlook app state can become corrupted Accepted troubleshooting for this launch problem includes clearing the local new Outlook data by deleting the Olk and OneAuth folders after closing Outlook and other Microsoft apps. Those folders are recreated when the app starts again.
    2. The app installation or app state may need to be reset Supported steps for new Outlook issues include:
      • End Microsoft Outlook in Task Manager
      • Reopen it
      • If needed, uninstall and reinstall new Outlook for Windows from the Microsoft Store
    3. Some launch failures are service-side or account-data related rather than device-only problems One documented Q&A resolution describes a startup failure during StartupData as typically occurring when new Outlook cannot load account data from the service. That indicates some launch issues are tied to account or server-side conditions, not only the local PC.
    4. Temporary product issues can also affect Outlook startup Microsoft has documented cases where Outlook launch failures were under active investigation and advised using Outlook on the web temporarily while the fix propagated.

    Because the issue happens about once a week and affects calendar access, the most supported explanation is a mix of intermittent new Outlook app-state corruption or a temporary service/account-data loading issue.

    A practical supported path is:

    1. When it happens, end Outlook completely
      • Right-click Start > Task Manager
      • Select Microsoft Outlook > End task
    2. If it keeps recurring, clear the local new Outlook state
      • Close Outlook and other Microsoft apps
      • Delete these folders:
        • C:\Users\<UserName>\AppData\Local\Microsoft\Olk
        • C:\Users\<UserName>\AppData\Local\Microsoft\OneAuth
      • Restart Windows
      • Open new Outlook again
      Note: these folders are recreated automatically.
    3. If still recurring, reinstall new Outlook for Windows
      • Start > Settings > Apps > Installed apps
      • Uninstall new Outlook for Windows
      • Reinstall it from the Microsoft Store
    4. Use Outlook on the web when the issue is active That is the documented workaround in Outlook issue investigations and avoids losing calendar access while the desktop app is failing.

    References:

    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.