Unread counts rubbish in Mail

Sometimes Mail reports as unread messages that can't be seen.

There is a Rebuild menu option for Mail but this doesn't always achieve very much.

More useful can be manually deleting files named "Envelope Index.." from ~/Library/Mail/Vnn/MailData and restarting Mail. It will reimport everything.

» Calendar running slowly

» Deleting from iBooks

» Entering passwords in Safari

» Error moving mail to junk folders

» Mount Points Hidden

» Netbeans Debugger

» Running MySQL on Catalina

» Slow Junit Tests

» Special File Access

» SSH access after domain host changed

» SSH access deprecated key type

» Unread counts rubbish in Mail