Mail Upgrade message in Mavericks won't go away
Have upgraded from 10.8 to 10.9 Mavericks on my Macbook Pro, everything pretty much went fine, except for a problem with Mail.
Everytime I open it, I get the below screenshot, saying "Welcome to Mail. To use the new features in Mail, your Mail messages need to be downloaded to this computer...."
If I click continue, I get a "bing" sound and then my Mail opens up, but I get the same message each time I open Mail.
Annoying.
Mail-OTHER, OS X Mavericks (10.9)