You may not want to use Gmail in your browser, because it stores a cookie with your credentials in it. Even if you’re logged out. This allows Google to track your browsing activity, among other things.However, if you use an email client, like Thunderbird, you still have to login via a web-based interface. Granted, this is in T-bird’s browser (have you locked it down like you do with Firefox?), but it’s possible to track you across multiple browsers these days.So if you have to use Gmail, consider using an email client that doesn’t require you to log in via browser interface, such as Slypheed or Trojito, both of which work for Linux and Windows.If you’re using iOS, logging into Google anywhere is logging into Google everywhere (think Maps, email, anything).If anyone has some expertise to add about this, I’d love to hear it.Note: Please don’t comment with “Don’t use Gmail”. We all know we should avoid it if possible. Not everyone can, and it’s really none of your business why.