Chris uses Carbonite and wants to know if there's a better email program than Outlook. He also wants to know if that would make it better for backing up. Leo says that Outlook puts everything in one giant .pst file, but Mozilla Thunderbird breaks it out into individual files. Carbonite or any backup company just will backup whatever files he has, it won't care what program he's using. It's up to him to have it backup the right files. So as long as he backs up his Thunderbird Profile, he should be OK.
(Disclaimer: Carbonite is a sponsor).