The iPhone already supports standards-based POP and IMAP email accounts, and as of 2.0 supports the big-in-business Exchange format accessed via ActiveSync. But much as Microsoft would like to completely own everythat space, there are several competing corporate communication soluting out there, including RIM/Blackberry's North American powerhouse, Novell's Groupwise (which I'm still not convinced Chad didn't just make up...), and of course, good old Lotus Notes.