Intelligent free-time search

Techniques are disclosed for performing free-time searches that exploit information of the type used with electronic calendars. By leveraging advanced calendaring system information and using location, other context information such as corporate policy, legal constraints, and technology constraints, and user-specific preferences to provide a complete picture of a person's availability, the functionality (and therefore the value) of scheduling systems in increased, resulting in an ability to schedule meetings with more accuracy and less rework. Various allowable participation types for meeting invitees may be specified, and each invitee's availability is determined accordingly. Location-sensitive travel times (including optional user-specific travel time adjustments) are used in preferred embodiments when in-person participation is required.