I'm pretty sure with Google you can link up to 10 accounts, and you can have as many Gmail windows open as you want for various accounts that are linked. So if you want five different Gmail tabs open at the same time, just link the accounts behind them and it's possible. I personally have two independent Gmail accounts open at all times.
Gmail might warrant a second look. I have not touched it in more than two years. Yahoo Mail is good enough for me to pay for their enhanced service, Google would have to offer something better.
As a long-time Yahoo mail user, I'd say basically any email service is better than Yahoo Mail, at least if we're talking about their webmail interfaces.
You certainly can. It works well except for 1) from time time you get an odd gmail error and the only way to get it working is to log out of all your accounts, and 2) it would be nice if there was an easier way to log into 8 gmail accounts at once. It's a pain setting up your 8 windows every time you get logged out.
