All Email Going to Unread but not in Inbox

Sounds like when you upgraded to V10 you chose “the default install” which then categorises all your incoming and existing mail using an algorithm to sort in Inbox mail folders such as eg: Primary, Promotions, Social, Other, Updates etc

So look on the right of the Primary Inbox folder and see if you have other different named Inbox Tabs. If you do, then click the link below to see how to move messages back to the Primary tab or any other tab you want for those sender messages in future.

You can also disable any Category tabs you don’t want or disable the Categories completely.