Why "Welcome to Mail" setup solution
Just wanted to tell anyone interested that after over a year of using Mail, today, when I launched it, I got the "Welcome to Mail" window. I quit, deleted the preferences file for com.apple.mail.com, but it didn't access my Library=Mail folder. So I quit, restored that prefs file from Time Machine from a back up yesterday and that fixed it.🙂
MacPro (Early 2008), Mac OS X (10.5.8), 2 x 2.8 Ghz Quad Core, 8GB RAM, ATI Radeon HD 2600