Originally Posted By: peter

(Actually Exchange is OK at that these days with the mail itself. But I don't know whether you can get at the calendaring and stuff with non-MS tools yet?)

There has always been a COM interface that you could create/edit/delete mail/calendar/task/etc entries with. It hasn't always worked well and it doesn't typically give you complete access to all the fields in Exchange records, but it has always been there for third party developers to target.
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