If you are an Outlook user, you probably have it open all the time. Now you can update your Twitter status and follow your friends without having to open any other applications. OutTwit seamlessly integrates Twitter into Outlook.
Features
Update your Twitter status directly from Outlook.
Receive your friend updates as Outlook messages.
Configurable new message check interval.
Assign custom categories to new messages.
Shorten URLs with tinyurl.
Archive, manage and search your tweets the
same way you manage your email (Details).
Automatically sort new tweets into per-sender folders.
See graphs of your Twitter usage statistics.