Dick Filson wrote:
Why doesn't the Mail window open without anything appearing below the menu bar? I have Yahoo mail via ATT and I can access that but the apple mailer does not sync with it to show my mail. I have checked my mailer''s accounts and Yahoo mail is correctly listed.
Because you closed the active window using the red pill button(?)
Command Q will quit the App.
There are very few apps that will quit w/ the red pill.
If you mail is launched Command 0 ( that is a Zero) will open the message viewer
if this is not your issue—maybe you can paint a bigger picture, a screen shot may help elucidate your current situation...redact any personal information
screen shots
Take screenshots or screen recordings on Mac - Apple Support