Sending, receiving, and organizing email in Outlook.com
Hello, thank you for reaching out to Microsoft Q&A.
Did you accidentally mark all of your inbox emails as Junk?
What happens if you select a group of emails in the Junk Email folder and move them back to the Inbox folder? Do you receive future emails from those senders in your Inbox after that?
In the Junk email folder, select the emails you want to receive them on your inbox.
Mark it as 'Not junk' or Move them to the inbox folder.
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Alternatively, go to https://outlook.live.com/mail/0/options/mail/rules and sign in with your Microsoft account.
Check whether you have created any rule that automatically moves your inbox emails to the Junk Email folder. If you find such a rule, delete it.
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Then, go to https://outlook.live.com/mail/0/options/mail/junkEmail and check the Blocked senders and domains section.
See if you have added the senders’ addresses to the blocked senders list. If so, remove them from the list.