As to UI, you've got it backwards, S60 was designed for one thumb operation on cell phones and S80 was designed specifically for the Communicator, which had unusually wide screen format, four soft keys, function keys and QWERTY, and is very DISsimilar to Hildon. Changing the UI was NOT an easy change, like some imply. Nokia/ES did not ignore these considerations. They made a business decision that S80 is a niche product with little 3rd party app support, that the field of handheld computer-like devices is getting very competitive, and that the migration to S60 was necessary to keep the product successful. They are trying to expand the appeal to business users, BB users, etc., who have never seen a Nokia device as a computer-like tool. Those people ask about software compatibility all the time. Their conclusion is that global sales of the S60 Communicator will exceed the sales of any previous Communicator in any previous year, and bring in NEW customers, and they are probably right. Nokia is a company that demands performance and looks 3 years out and not at the past.