Confusingly.
Google Mail, or Gmail to most, is a wildly popular free email service. It’s fast, easy to use, and sports one of the best spam filters around.
What most people don’t realize is that Gmail looks at the world a little differently than other email services. In doing so, it leverages something else that Google has a strong track record with: search.
Gmail labels aren’t what most people think they are. Normally, that’s not an issue, but when accessing Gmail using a desktop email program via IMAP, it can cause a lot of confusion.