And ever since college we've been convinced that designing a software system without a back out strategy is just darned irresponsible.
So we combined both of these lessons in our video of Sumatra's UNDO capability in action.
Sumatra Development leads the field of migrating entire calendar servers to Exchange. We migrate Oracle Calendar Server, Oracle Beehive, Apple iCalendar, and Zimbra to Microsoft Exchange keeping all meeting information and resource bookings intact. We migrate calendars server-to-server between Exchange and Office 365 while keeping meetings live and doing incremental syncs quicker than any other solution.