OutTwit is an application that lets you use twitter from  Microsoft Outlook. ♦♦♦♦

• Update your Twitter status directly from Outlook.
• Receive your friend updates as Outlook messages.
• Archive, manage and search your tweets the same way you manage your email.
• Track keywords. OutTwit will automatically download ALL tweets matching the keywords you specify, even if you are not following the tweet sender. This feature is perfect for keeping up to date with the Twitter buzz on your name, brand, interests, etc.
• See new tweets at a glance.
• Assign custom folder and categories to new messages.
• Use Outlook’s “Reply” and “ReplyAll” commands to send twitter direct messages and @replies.
• Automatically sort new tweets into per-sender folders.
• Shorten URLs with tinyurl.
• See graphs of your Twitter usage statistics.
• Tweets sent to you (@replies and direct) are marked with high importance, so you can see them at a glance.

System requirements:

• Windows XP or Vista with the latest Service Pack.
• Outlook 2003 SP3, 2007 SP1.
• OutTwit does NOT work with Outlook Express.