Outlook work account lost half amount of mails after update

Question

Outlook work account lost half amount of mails after update

Harris 185

I need the support, my outlook account is: <Removed PII>.com

I'm just change my outlook app on MacBook to the New version (update with the newest MacOS ver) and then so many emails gone, I've tried in junk folder, rules,...but nothing to recover

Any guidance ?

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Answer accepted by question author

Hin-V 16,830 Microsoft External Staff Moderator

Hi @Harris

Thank you for posting your question in Microsoft Q&A.

Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.

We sincerely apologize for any inconvenience this may have caused to your work.

If possible, could you please try checking your account on Outlook Web App (OWA)? Log in to Outlook on the web using your account to see if the missing emails appear there. Sometimes, emails are still accessible through the web interface even if they don’t show up in the desktop app.

Additionally, you might want to try removing and re-adding your account in Outlook. This can often resolve sync issues and help recover missing emails.

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

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.

Harris 185 Reputation points

2025-10-16T13:59:29.4433333+00:00

OWA is fine, the issue just happen on App, I ve tried to sign out and sign in again, but not work
Hin-V 16,830 Reputation points Microsoft External Staff Moderator

2025-10-16T14:19:20.39+00:00

Hi @Harris

It looks like this issue might be related to the local cache for your account in the new Outlook app. To resolve this, you could try forcing Outlook to redownload all your emails from the server, which often helps fix synchronization issues after an update. Here are the steps:

Open your Outlook.

Click on Tools in the menu bar at the top of your screen. Select Accounts.

In the Accounts window, choose the email account that's missing emails.

At the bottom of the account pane, click the three dots and select Reset Account.

Outlook will then begin re-syncing your mailbox. Please note that this process may take some time depending on the size of your mailbox.

I hope this helps.
Hin-V 16,830 Reputation points Microsoft External Staff Moderator

2025-10-17T09:09:47.12+00:00

Hi @Harris

I hope you're doing well. Just wanted to follow up and see if there's been any progress on the issue we discussed.

Let me know if there's anything I can assist you with further.

Looking forward to hearing from you.

1 additional answer

Your answer

Harris 185 Reputation points

2025-10-16T13:59:29.4433333+00:00

OWA is fine, the issue just happen on App, I ve tried to sign out and sign in again, but not work
Hin-V 16,830 Reputation points Microsoft External Staff Moderator

2025-10-16T14:19:20.39+00:00

Hi @Harris

It looks like this issue might be related to the local cache for your account in the new Outlook app. To resolve this, you could try forcing Outlook to redownload all your emails from the server, which often helps fix synchronization issues after an update. Here are the steps:

Open your Outlook.

Click on Tools in the menu bar at the top of your screen. Select Accounts.

In the Accounts window, choose the email account that's missing emails.

At the bottom of the account pane, click the three dots and select Reset Account.

Outlook will then begin re-syncing your mailbox. Please note that this process may take some time depending on the size of your mailbox.

I hope this helps.
Hin-V 16,830 Reputation points Microsoft External Staff Moderator

2025-10-17T09:09:47.12+00:00

Hi @Harris

I hope you're doing well. Just wanted to follow up and see if there's been any progress on the issue we discussed.

Let me know if there's anything I can assist you with further.

Looking forward to hearing from you.

Answer 1

Diane Poremsky 8,280 Independent Advisor

What type of email account do you have configured in Outlook? POP, IMAP, Outlook.com, or Microsoft Exchange?

If IMAP or POP, were you using Microsoft Sync or a direct sync to the POP or IMAP server?

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