Check out the new Guided Walkthroughs Microsoft has put up.
Of special interest to those followers of our blog are:
Sumatra Development leads the field of migrating entire calendar servers to Exchange. We migrate Oracle Calendar Server, Oracle Beehive, and Zimbra to Microsoft Exchange keeping all meeting information intact. We are migrating calendars server-to-server between Exchange and Office 365 while keeping meetings live and doing incremental syncs. We just added Apple's PostgreSQL iCalendar server to Microsoft Exchange calendar migration.
There are a simple ways to customize the Sumatra Double Booking cmdlet, and most of them involve a text editor. Let's look at the mess...