If you work for a company running Exchange, you probably use Outlook's free/busy viewer every day to schedule meetings. This great tool allows you to easily see when your colleagues are free for a meeting. Unfortunately, without great deal of effort, you cannot use this scheduling tool to see free/busy information for people outside your business. However, a new service, FreeBusySharing, solves this problem. Each person using the service will need a supported version of Microsoft® Outlook (i.e., 2002, 2003 or 2007).

Signup for a free account here: http://freebusysharing.com/register.php?newuser=1.