[Ken Case]

Unfortunately, 10.5's IMAP calendars are invisible to any software which uses SyncServices, i.e. any software which was written to synchronize with 10.4's calendars.

There's a new 10.5-specific CalendarStore API which we can use to get at those calendars, but it takes a completely different approach: it just tells you what's in the calendar now, it doesn't tell you anything about which items have changed since last time you looked. So there's a whole bunch of 10.5-specific code that would need to be written to support IMAP calendars.

We are looking at adding support for the 10.5-only CalendarStore at some point, but for 1.1 our focus has been on adding synchronization support so you can share all your information between computers—not just task names and dates and plain text notes, but also project structure, contexts, rich text notes with attachments, etc. And we've also been writing a native, synchronizing version of OmniFocus for iPhone and iPod Touch so you can take all that information with you and access or change it or add to it wherever you are.