Thunderbird 3.1 (alt DL) is a great email client that gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.
Changes:
- Faster Search Results - Message indexing is faster and provides users with faster search results.
- Quick Filter Toolbar - New Quick Filter Toolbar lets you filter against search terms, tags, starred messages, address book contacts, new emails, and attachments.
- New Migration Assistant - The new Migration Assistant gives Thunderbird 2 users a way to choose the new features in Thunderbird 3.1 or to keep their current features and settings.
- Saved Files Manager - New Saved Files Manager displays all the files you downloaded from your email to your computer.
- Mail Account Setup Wizard - Hundreds of ISP settings have been added to make setting up Thunderbird easier.
- Improvements to Stability, Memory, and Password Handling
If you need an email client for your Windows desktop, this is the one I highly suggest.