If you do a lot of emailing with long-distance friends and colleagues, there’s an Outlook plugin that you’ll probably want to grab: Sender’s Time Zone. Like it sounds, this plugin will display the time zone of the email sender right next to the standard Outlook timestamp. It also calculates the difference from your time zone and the time since the message was sent, too. Handy! There’s nothing to configure to get it working, you simply install the plugin and that’s it.
Sender’s Time Zone is available as a free download and works in Outlook 2000, XP (2002), 2003, and 2007.