Cannot receive all my emails since Outlook upgrade

Question

I have two email accounts in outlook. Since the upgrade late last year, I cannot receive all emails in one of my accounts. The other account does not seem to be affected. There is not a storage issue; there is not a rules issue; the senders are not in the blocked list. I have contacted outlook help and there is not an answer that has helped.

Answer 1

 Hello Kelli,
Thank you for contacting the Microsoft Q&A forum. I understand how frustrating it is when one account functions perfectly while the other fails to sync, especially after you have already verified your storage, rules, and blocked senders. Since this issue began following a recent update, it is possible the "New Outlook" interface is experiencing a synchronization glitch with that specific account provider. 

To narrow this down, please first log in to your email provider's webmail (e.g., Gmail.com, Yahoo.com, or your custom domain webmail) for the affected account.

If the missing emails are visible there, please try the following steps to refresh the Outlook application: 

• Remove and re-add the affected account: Go to Settings > Accounts, remove the problematic email, and add it back to force a fresh sync. 
• Repair or Reset the Outlook app: Go to Windows Settings > Apps > Installed apps, find Outlook (New), select Advanced options, and click Repair. If the issue persists, try Reset. 
• Revert to Classic Outlook: In the top-right corner of Outlook, toggle the "New Outlook" switch to OFF. Outlook will restart in the traditional version; wait a few minutes for a full sync to see if the missing emails appear. If all emails arrive normally: I suggest staying in Classic Outlook for the time being. It offers more robust IMAP control and is generally more reliable for multi-account management. You can always test the "New Outlook" again after future updates. 

Note: If the emails are also missing from your webmail (the browser version of your email), the issue is likely not with the Outlook app itself. In that case, I recommend contacting your email service provider directly, as there may be a server-side delivery issue or an account filter active at the source. 

I hope these steps help you recover your missing communications. Should you have other questions, please do not hesitate to reply to this thread. I am more than happy to provide further assistance. 

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. 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.