Share via

Outlook 2024 reminder popup collapsed to tiny white box – cannot view or dismiss reminders

Jenny 0 Reputation points
2026-06-09T12:09:13.3566667+00:00

Outlook 2024 reminder popup collapsed to tiny white box – cannot view or dismiss reminders

Outlook Classic

  1. Office LTSC Professional Plus 2024
  2. Version 2408 Build 17932.20790
  3. Windows 10
  4. 200% display scaling
  5. Reminders still fire
  6. Reminder popup appears as tiny white rectangle with only close button visible
  7. outlook.exe /cleanreminders made no difference
  8. Office is fully up to date
  9. Creating a new Outlook profile previously appeared to help but problem returned
  10. Currently have multiple active reminders which cannot be viewed
Outlook | Windows | Classic Outlook for Windows | For business
0 comments

3 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Jenny 0 Reputation points
    2026-06-09T15:06:12.23+00:00

    Vergil,
    Thank you, I did try that.

    The only success I have had is deleting WindowPos on the registry key. Outlook then recreates the key automatically.

    Then i have the remimder list open on a second, low res screen.

    So I think it's the test scaling causing the problem.

    Your thoughts appreciated ... ?

    Was this answer helpful?

  2. Vergil-V 14,110 Reputation points Microsoft External Staff Moderator
    2026-06-09T13:22:57.5766667+00:00

    Hi Jenny

    First of all, you could review the AI response to see whether it provides any additional insight. 

    In the meantime, based on my research, you may consider trying the following approach, as it has been confirmed by other users in similar situations: 

    • Open Outlook 
    • Switch to the Calendar module by selecting the calendar icon or pressing Ctrl + 2 
    • Close Outlook completely and ensure all OUTLOOK.EXE processes are ended in Task Manager 
    • Reopen Outlook normally 
    • Trigger a reminder or wait for one to appear, then check whether the issue persists 

    I hope this brings additional insight. If you have any updates after trying these steps, please feel free to share. 

    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.

    Was this answer helpful?

    0 comments

  3. AI answer

    2026-06-09T12:09:33.29+00:00

    This is a known issue with the classic Outlook reminders dialog in recent builds, especially with higher display scaling and certain appointment fields.

    In the current build (2408) the problem can be triggered by long Subject text, and in later builds also by long Location text. Microsoft has already fixed the long-Subject issue in 2408 and is rolling out a further fix for long Location values in 2410.

    For the environment described (Office LTSC 2024, classic Outlook, build 2408, 200% scaling), use these workarounds until a build with the full fix is installed:

    1. Shorten problematic appointment fields
      1. Open the calendar in Outlook.
      2. Edit appointments that have very long text in the Location field (and, if applicable, very long Subjects).
      3. Shorten the Location text (for example, remove long URLs or extra descriptive text) and save.
    2. Fully terminate and restart Outlook
      1. Open Task Manager.
      2. On the Processes tab, right‑click Microsoft Outlook and select End task.
      3. Start Outlook again and test the reminder dialog.
    3. Adjust Windows display scaling
      1. In Windows, open Settings > System > Display.
      2. Temporarily set Scale to 100%.
      3. Test the reminder popup. If it displays correctly, this confirms the known rendering issue.

    Once the fixed builds are available for the channel used by Office LTSC Professional Plus 2024 and installed, the reminder dialog should render correctly without these workarounds.

    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.