For Outlook.com, check these areas in order:
- Check Junk Email and move any valid messages back:
- If a message is in Junk Email, select it and choose Report > Not junk.
- Messages in Junk Email are automatically removed after 30 days and are not recoverable.
- Check the Other tab if Focused Inbox is enabled:
- Messages may be delivered there instead of the main Inbox.
- If found there by mistake, select the message and choose Move to > Move to Focused inbox.
- Check Outlook.com settings that can hide or redirect mail:
- Review Junk Email settings and the Junk Email folder.
- Check whether email forwarding is enabled.
- Check whether any email rules are moving or hiding messages.
- Make sure the message list is sorted correctly: Filter > Sort > Date.
- If the issue happens with mail from a specific sender:
- Ask the sender to review Sender Support in Outlook.com.
- If Outlook is being accessed through another mail app:
- Another email app can incorrectly mark messages as junk.
- Using a Microsoft app such as Mail for Windows 10 or Outlook for Windows can help avoid that.
- If Outlook.com is opened in Firefox and the inbox is not loading correctly:
- Some Firefox add-ons can interfere with inbox loading. Disable or remove those add-ons and test again.
If these checks do not resolve it, use Outlook.com support from the Help menu and the Still need help? option.