How can I recover missing data from an Outlook for Mac Calendar?

Question

How can I recover missing data from an Outlook for Mac Calendar?

Peter Millward 0

All my personal entries for my Outlook for Mac Calendar have disappeared.

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2 answers

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Answer 1

Julie Huynh 1,100 Independent Advisor

Dear @Peter Millward,

Good day! Welcome to Microsoft Q&A forum!

Based on your description, I understand that all of your personal entries in your Outlook for Mac Calendar have disappeared and you're looking for help recovering the missing data.

I sincerely apologize for the inconvenience caused by this issue.

To understand the situation better and provide you with the most suitable support, could you confirm the following information:

I could see that your question is in the "For business" forum/tag, but to better support you, may I reconfirm: Are you using a personal account (e.g. @outlook.com, @hotmail.com) or a work/school account (e.g. @company.com, @edu)?
Were these calendar entries stored under a specific calendar (e.g., personal, local ‘On My Computer’, or a specific email account’s calendar)?
Did the events disappear all at once, or have they gradually gone missing over time?
Are the missing events also gone when you check the calendar online (e.g., Outlook on the web) or only in the Outlook for Mac app?
Have you changed any sync settings or removed/re-added an account recently?
Did anything change with your device, like a migration, reinstall, or storage cleanup?

Your confirmation would be very helpful in ensuring you receive the most suitable support!

If you’re able to share a bit more about your situation, I might be able to suggest some helpful next steps.

Please understand that our initial response does not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution.

Kindly let me know when there are updates or if you need further assistance. Any updates you’re able to share would be really helpful. I appreciate your time and look forward to hearing how things are going!

Thank you for your time and patience.

If you have extra questions about this answer, please click "Comment".

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.

Peter Millward 0 Reputation points

2026-03-22T13:14:16.81+00:00
I am answering your questions below:

I could see that your question is in the "For business" forum/tag, but to better support you, may I reconfirm: Are you using a personal account (e.g. @outlook.com, @hotmail.com) or a work/school account (e.g. @company.com, @edu)?

I am using another account: @me.com (same as @icloud.com).

Were these calendar entries stored under a specific calendar (e.g., personal, local ‘On My Computer’, or a specific email account’s calendar)?

There was only one calendar on one Outlook account.

Did the events disappear all at once, or have they gradually gone missing over time?

They disappeared all at once. The entries that disappeared were all appointments that were entries as all-day events. Many were under the categories "medical" or "networking"— personal reminders. There were many calendar entries that remained: from email invitations that had a small calendar icon (an Outlook invite to join a meeting). Once accepted, they automatically got entered into the calendar, showing up on a light blue strip. These calendar items have not disappeared.

Are the missing events also gone when you check the calendar online (e.g., Outlook on the web) or only in the Outlook for Mac app?

Yes, they are also gone when I check the calendar online.

Have you changed any sync settings or removed/re-added an account recently?

Yes, I had to reinstall Office 365 for the Mac (because my hard drive had to be reformatted). As a result I had to set up and re-add my four Outlook accounts.

Did anything change with your device, like a migration, reinstall, or storage cleanup?

See above. My entire hard drive had to be reformatted, and I had to re-install all my apps.
Julie Huynh 1,100 Reputation points Independent Advisor

2026-03-23T11:02:50.3433333+00:00
Dear @Peter Millward,

Thank you again for your patience and for sharing all the details about what happened.

After reviewing everything you described, here’s what I’ve confirmed:

Your @me.com / iCloud account was added to Outlook for Mac using IMAP. IMAP can only sync email and mail folders, and does not have any protocol support for syncing calendars, contacts, or tasks.

Because IMAP doesn’t sync calendar data, Outlook for Mac stores that information locally in the “On My Computer” folders. These folders are not connected to any server, and the data inside them stays only on the device.

Since your Mac was reformatted and Outlook was reinstalled afterward, any data stored only on the device, including local calendar items would be lost.

For reference: About On My Computer folders in Outlook for Mac

Before the reformat, do you recall whether you were also using the iCloud Calendar independently on your Mac or iPhone?

For example:

Did you ever see those all‑day events inside the Calendar app on your iPhone/iPad/Mac, not just inside Outlook?

Or did you create those personal reminders only from within Outlook for Mac?

This is important because if the events were ever synced to iCloud (via Apple’s Calendar app), they may still be recoverable from iCloud’s own calendar history.

Thank you again for your patience as I narrow this down.

Kindly let me know whether the events ever appeared in iCloud or on your other Apple devices when you have time.

I really appreciate your understanding!
Julie Huynh 1,100 Reputation points Independent Advisor

2026-03-24T11:35:13.4+00:00

Dear @Peter Millward,

Good day! I hope everything is going well on your end.

It’s been a little while, so I just wanted to follow up and see how things are progressing with your concern. If you've run into any challenges or if there's anything further that I can help with, please don’t hesitate to let me know. Any updates you’re able to share would be greatly appreciated.

Thanks again for your time and attention! I look forward to hearing from you.
Julie Huynh 1,100 Reputation points Independent Advisor

2026-03-26T18:42:41.38+00:00

Dear @Peter Millward,

I hope things are going well on your end. As there hasn’t been any recent activity, I’ll move on to other posts for now. That said, if you’re still facing issues or have new questions, please don’t hesitate to tag me in a comment, I’ll be happy to help further.

Thank you very much for your understanding and kindness!

Answer 2

Try the following checks and recovery steps in Legacy Outlook for Mac.

Check the calendar view and filters

In Outlook for Mac, go to the Calendar view.
Make sure the correct calendar is selected in the left navigation (for example, the calendar under On My Computer vs. an Exchange/Office 365 calendar).
Verify that the view is not filtered to hide past or private items (switch to a standard view like “Day”, “Week”, or “Month”).

Check the On My Computer section Personal entries are often stored in local “On My Computer” folders.

If On My Computer is not visible:
- Go to Outlook > Preferences… > General.
- Clear Hide On My Computer folders.
Return to Calendar and check if a local calendar with the missing items appears.

Recover from Deleted Items If calendar items were accidentally deleted, they may still be recoverable.

Switch to Mail.
Open the Deleted Items folder.
Look for calendar items (appointments/meetings) that match what is missing.
Drag them back to the Calendar or right‑click and move them to the desired calendar.

Recover from an Outlook archive (.olm or .pst) If a previous export or backup exists, the calendar can be restored from it. This is only available in Legacy Outlook for Mac.

In Legacy Outlook for Mac, go to File > Import.
Choose Outlook for Mac archive file (.olm) or Outlook for Windows archive file (.pst), depending on the backup.
Complete the wizard to import.
After import, the data appears under On My Computer in the Calendar navigation pane.

Check other profiles or accounts If multiple profiles or accounts exist, the entries may be in another profile or account calendar. Open each account’s calendar in turn and verify whether the items appear.

If the calendar data was only stored locally (On My Computer) and there is no backup (.olm/.pst), no Deleted Items copies, and no server‑based account copy (Exchange/365), the missing entries cannot be reconstructed from Outlook alone.

References:

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How can I recover missing data from an Outlook for Mac Calendar?

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