Microsoft has released Windows 7 in three different editions. The table below will show you the differences between the editions. If you buy one edition and decide to upgrade Microsoft has built in a tool called "anytime upgrade" so you can go online and purchase the new edition and upgrade via the internet instantly.
Features
Home Premium
Profressional
Ultimate
Make the things you do every day easier with improved desktop navigation.
Start programs faster and more easily, and quickly find the documents you use most often.
Make your web experience faster, easier and safer than ever with Internet Explorer 8.
Watch many of your favorite TV shows for free when and where you want with Internet TV.
Easily create a home network and connect your PCs to a printer with HomeGroup.
Run many Windows XP productivity programs in Windows XP Mode (separate download).
Connect to company networks easily and more securely with Domain Join.
In addition to full-system Backup and Restore found in all editions, you can back up to a home or business network.
Help protect data on your PC and portable storage devices against loss or theft with BitLocker.
Work in the language of your choice and switch between any of 35 languages.