Outlook Not Receiving Email
Emails you know have been sent aren't appearing in the inbox, either occasionally or consistently, despite the account otherwise appearing connected.
Quick answer: First confirm whether the email is genuinely missing or just misfiled — check Junk/Spam and any rules that might be redirecting mail before assuming a connection problem. If it's account-wide and sudden, a sync or authentication issue is the more likely cause.
Likely causes
- The email landing in Junk/Spam or another folder due to a filter or rule
- An inbox rule inadvertently moving or archiving incoming mail
- A sync issue between Outlook and the mail server
- The account's storage being full, in some cases silently blocking new mail
What you can safely check yourself
- Check the Junk/Spam folder and any custom folders that inbox rules might send mail to
- Review Rules (File > Manage Rules & Alerts) for anything unexpectedly redirecting mail
- Check the account isn't showing a sync error or "disconnected" status in the bottom status bar
- Log into the webmail version of the account directly to confirm whether the email actually arrived there
When it needs a proper look
If the email is confirmed to have arrived on the server (via webmail) but still won't sync to Outlook, that's a sync or profile issue worth a proper look.