ALL Calendar entries deleted after performing a 'Repair Profile' in Outlook

Question

Searching for a solution to this problem - https://learn.microsoft.com/en-us/answers/questions/4674425/emails-not-reflecting-in-outlook-desktop-applicati?orderby=newest&page=1#answersI followed the possible remedies. I chose the Repair Profile option and once that was completed I opened Outlook and now all my Calendar entries have gone...and the original problem still exists!

Answer 1

Repairing an Outlook profile should not permanently delete server‑based calendar data, but it can:

• Clear or recreate the local cache (.ost) so that the calendar appears empty until it re‑syncs, or
• Break the connection to the mailbox so nothing syncs at all.

Use these steps to recover and fix the connection:

1. Verify the calendar on the server
   • If the account is Microsoft 365 / Exchange / Outlook.com, sign in to the mailbox in a browser.
   • Check the Calendar there. If entries are present online, they are not lost; the issue is with Outlook’s local profile or cache.
2. Repair the Outlook profile connection
   • In classic Outlook for Windows, go to File > Account Settings > Account Settings.
   • On the Email tab, select the affected account and choose Repair.
   • Follow the wizard and then restart Outlook.
   • This lets Outlook diagnose and fix profile connection issues that may be preventing calendar sync.
3. If repair does not help, recreate the Outlook profile
   • Create a new Outlook profile as described in Create an Outlook profile, then restart Outlook.
   • In the Choose Profile dialog, select the new profile and select OK.
   • If the calendar entries reappear, the old profile was corrupt. Use the new profile going forward.
4. If the calendar is stored in a local data file (.pst)
   • If this is a POP or local‑only calendar, the data may be in a .pst file rather than on a server.
   • Locate any existing .pst files (for example under C:\Users<username>\Documents\Outlook Files\).
   • In Outlook, use File > Open & Export > Open Outlook Data File and open the .pst to see if the calendar items are there.
5. Repair corrupted data files (if needed)
   • If the .pst or .ost file is corrupted, run the Inbox Repair Tool (scanpst.exe) as described in Repair Outlook Data Files (.pst and .ost).
   • After repair, reopen Outlook and check the calendar.
6. Keep Outlook updated
   • Install the latest Office/Outlook updates to ensure you have current fixes, as recommended in the Outlook troubleshooting guidance.

If the calendar is empty both in Outlook and in the mailbox when viewed in a browser, and there is no backup .pst containing the calendar, the items are unlikely to be recoverable.

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References:

• Fix your Outlook email connection by repairing your profile
• I can’t start Microsoft Outlook or receive the error “Cannot start Microsoft Outlook. Cannot open the Outlook Window”
• How to troubleshoot missing and duplicate appointments in Outlook