- Check & Update Your Rules:
Make sure that your 'rules' are up-to-date, and are properly filtering specific types of emails. - Check Your Outlook Inbox for Duplicate Messages:
It is possible that various emails appear multiple times, due to a 'message loop' where the same message is passed around. Check to see if there are duplicate messages. - Check Your Outlook Category:
Make sure that your emails are assigned to the correct categories. In Outlook, this feature can be found in the custom tab in the rules pane. - Check Your Antivirus Software:
Check that your Anti-virus software is not blocking or filtering certain types of messages. - Check Your Outlook Settings:
Make sure the settings for your Outlook account are correct. Go to the 'Settings' tab and see if any of the settings are wrong. - Reindex Your Mailbox:
Reindexing your mailbox can help Outlook to filter and organize emails more efficiently.