[marisa8184]

Thanks for the ideas guys, I have got round this for the moment by creating artificial calendars in ical 'on my mac' and then syncing omnifocus tasks to these.

This gives back the syncing to calendars we used to have. But this doesn't get reflected online, and my workplace is all pc based. At the moment I am bringing in my mac, but this isn't a permanent answer. I end up doing most of my work on my own machine as it's so much better and more efficient, but this isn't going down terribly well with some people as you can imagine.

Oh well, I understand that with Apple opening the Reminders API a lot of developers are looking at some kind of integration, so maybe this will happen.