Pantheon-Mail Fails to Start
Running Debian Unstable here. Pantheon-Mail starts with the failure dialog in the screenshot. The smaller window below the dialog appears on top. I rearranged the windows so that I could take a picture.
In essence the first window has the title "Unable to open local mailbox for ivan@whatever". The body has the text:
"There was an error opening the local account. This is probably due to connectivity issues.
Please check your network connection and restart Mail."
Then there is the OK dialog button.
The second window is superimposed on the first has the title "Mail", a spinning wheel and the text "Mail update in progress..."