The document discusses Thunderbird, an open source email client created by Mozilla. It notes that Thunderbird is available for Windows, Mac OS X and Linux, has a portable version, and incorporates features like message tagging, improved search and a Bayesian spam filter. The document also includes a brief comparison of Outlook versions over time and some pros and cons of Thunderbird versus Outlook.

1. Open Source:: How Companies Can Create Profit Reclaim Your In Box Pete DuMelle Thunderbird / Lighting

2. About Mozilla Messaging We’re driven to improve the experience of people communicating with each other on the Internet. We believe that by finding like-minded people who want to help, we can have a real impact, and have a lot of fun doing it

3. Thunderbird • Mozilla Messaging • Windows, Mac OS X and Linux • Portable Version • Message Tagging, Improved Search • Thunderbird incorporates a Bayesian spam filter

4. Add-ons Contacts 68

5. Language Support 67

6. Message Reading 217

7. Miscellaneous 605

8. News Reading 93