meshcal

A outlook add-in that simply allows a user to invite a group of users to schedule an event and automatically identifying a common time where all users are available. The tool does not share the entire free/busy times but relies on a cryptographic tool called secure multiparty computation to identify common times while maintaining maximum privacy of the individual calendar information. MeshCal offers a free to try for meetings under 5 people, but will require a subscription for unlimited invitees.