Mail app, Flagged count always wrong

I have a problem with the Mail app. It always shows the wrong count after using it for a while. I already reset my spotlight index and also did the "Rebuild" in the app.

As an example below, it says "2" but no mail is marked (0 would be the right value)

Any suggestions? I use outlook.com as a mail provider.

Solution 1:

Tip: you can go to any folder accessible from your Mac by hitting cmd+shift+G on your keyboard (whilst being in Finder)

According to this answer you can do the following:

• Quit Mail if it’s open.

• In ~/Library/Mail/V7/MailData, delete any file that begins with “Envelope Index,” such as Envelope Index or Envelope Index-shm.

• Your home Library folder is hidden by default. To display it, choose Finder > “Go to Folder” and then enter ~/Library

• Open Mail.

• Mail creates new Envelope Index files. This process may take a few minutes, depending on how many messages Mail is reindexing.