Apple Mail Won't Authenticate GMail
The Apple Mail Gmail Problem
You have problems with Apple Mail authenticating and downloading new mail from your Gmail account. A window pops up asking for your user name and password. You enter the correct password, but it doesn't work. It's obviously broke, what's wrong?The Solution
Go to https://mail.google.com/ in your browser (Firefox, Safari, etc) and log in with your user name and password. If I'm correct, you will have to fill out a "CAPTCHA" which is the picture with one or two words that you need to enter. Once you have completed the captcha and logged in, you can log out if you wish and go back to Apple Mail. You may have to authenticate one more time, but this time it will work!