My Outlook won't allow incoming emails.

Question

My Outlook hasn't worked for the past 40 hours. Can you troubleshoot my situation?

Answer 1

Hi @tammy cline, 

Thank you very much for reaching out regarding the issue where incoming emails haven’t appeared in Classic Outlook over the past ~40 hours. I appreciate your patience and the details you provided. 

Here are my recommendations, please follow the steps below: 

A - Quick checks 

• Sign in at https://outlook.office.com. If OWA shows new emails > likely a desktop app issue and if no new emails in OWA > likely a server/mail‑flow issue. 
• Status bar (desktop Outlook): Check if it shows Working Offline/Disconnected/Trying to connect… 
• View & filters: View > Reset View, turn off Focused Inbox, and quickly check Junk/Deleted Items. 
• Mailbox storage (M365/Exchange): OWA > Settings > Storage. If near/full, empty Deleted Items and remove large items, then retest. 

B - Further troubleshooting  

1/ Start Outlook in Safe Mode  
Press Win + R, type:  
outlook.exe /safe  
and press Enter.  
Safe Mode runs Outlook without any add-ins.  
If Outlook connects successfully in Safe Mode, this indicates that one of your add-ins is causing a conflict. You can disable unnecessary add-ins via:  
File > Options > Add-ins > COM Add-ins > Go…  

2/ Clear filters, reset view, and turn off Focused Inbox 

• Go to Inbox > View > Reset View. 
• View > View Settings > Filter > Clear All, then Sort > Received (Descending). 
• Turn off Focused Inbox: View > Show Focused Inbox (toggle off), and check both Focused and Other tabs. 
• Review Junk Email, Deleted Items, and any custom folders where rules may have moved messages. 
• Make sure Outlook is not in Work Offline mode: Send/Receive > Work Offline (toggle off). 
• (Optional) Press F9 to force a sync. 
• IMAP only: Right‑click Inbox > IMAP Folders > Query, and ensure required folders are subscribed. 

3/ Recreate the Outlook profile (rebuild local cache/OST) 

This is the most reliable fix for a corrupted local cache. It does not delete server‑side mail. 
Note: If you use POP or have local PST data, please back it up first. 

To backup local data (Optional)  

• File > Open & Export > Import/Export > Export to a file > Outlook Data File (.pst) > choose folders > export. 

Create a new profile 

1. Open Control Panel > Mail (Microsoft Outlook) > Show Profiles  
2. Click Add… to create a new profile  
3. Set the new profile as the default  
4. Then launch Outlook and sign in.  
5. If you exported a PST, reattach via File > Open & Export > Open Outlook Data File. 

C - Contact Support 

If the issue still persists, please contact your organization’s IT team to check the mailbox quota, server-side forwarding or rules, quarantine, and to run a message trace. They can also review any tenant-wide mail-flow policies or service health advisories. 

In case your IT department cannot access the necessary information or make the required changes, I recommend asking them to open a request with Microsoft Support team through the Microsoft Admin Center. They have access to backend configurations and can perform a more in-depth investigation. At the very least, they can provide the most effective workaround to ensure your experience remains smooth and secure.         

We kindly ask for your understanding that, as moderators, we do not have access to the administrative tools or permissions required to investigate or modify these configurations. We also do not have the capability to initiate remote sessions for direct assistance. Our role is to guide users to the appropriate resources and support channels.     

I hope this information is helpful. Should you have any further questions or need additional assistance, feel free to reach out.   

I look forward to hearing your thoughts on this. 

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Answer 2

Work through these checks in order in classic Outlook for Windows:

1. Confirm the account password

• If the email password was changed recently on the provider’s website, update it in Outlook.
• In classic Outlook, remove and re-add the account if prompted for credentials repeatedly, using the current password.
• If the provider requires an app password (common with accounts that have 2FA), generate the app password on the provider’s site and use that in Outlook instead of the normal password. See the guidance under “Have you changed your password recently?” in the Outlook article.

2. Check for mailbox or account issues (if using Outlook.com / Microsoft 365)

• If using an Outlook.com or Microsoft 365 mailbox and nothing is arriving:
  • Make sure the Microsoft cloud storage and mailbox are not full. If storage is full, new messages are bounced and unrecoverable until space is freed.
  • If sign-in or account access is failing in other apps or on the web, use the Microsoft account sign-in helper or follow the steps to unblock your Outlook.com account if it was temporarily blocked.

3. Check filters, rules, and junk

• In Outlook.com or when using an Outlook.com mailbox:
  • Check the Other tab (Focused/Other) and ensure no filters are hiding messages.
  • Check Junk Email settings and the Junk Email folder. If legitimate messages are there, right‑click and choose Mark as not junk.
  • Review rules and forwarding settings to ensure mail is not being moved or redirected elsewhere.
• In classic Outlook, similarly review Rules and Alerts to ensure no rule is diverting or deleting new mail (for example, to RSS feeds, as in the referenced Q&A resolution).

4. Run the Inbox Repair Tool (for PST-based accounts)

• If using POP/IMAP or a profile that stores data in a .pst file, corruption can stop mail from appearing.
• Run the Inbox Repair Tool (ScanPST) as described in “Run the Inbox Repair Tool”:
  • Close Outlook.
  • Run the Inbox Repair Tool against the affected .pst file.
  • After repair completes, reopen Outlook and test send/receive.

5. Check connectivity and server errors

• Use Send/Receive in Outlook and note any error codes (for example 0x8004210a, 0x80042108, 0x800ccc0e, etc.).
• The Outlook troubleshooting article lists these errors and confirms they can be addressed with the same methods (password, server connectivity, Inbox Repair Tool, ISP/server checks).
• If errors indicate the server cannot be found or the connection is interrupted, contact the email provider or IT admin to confirm the mail server is online and that there are no firewall or network restrictions.

If, after these steps, Outlook still does not receive mail, capture any exact error message or code shown in the Send/Receive status and provide it to the email provider or admin; the referenced articles map those codes to further troubleshooting.

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References:

• I can't send or receive messages in Outlook
• Can't send or receive email in Outlook.com
• Stopped receiving emails on my account. - Microsoft Q&A