For a typical home user, that's true (home users don't use hardly any featureset). For corporate users, that statement is so far off the mark as to be laughable. There are tons of complex spreadsheets and documents that will not interchange effectively with any open source solution on any platform.

And that has less to do with any proprietary MSFT design than it does with the fact that particular features don't exist in the Open Source versions.

It's like dismissing Outlook. Outlook just makes your life that much easier, because it puts everything into one place. Email, tasks, calendar, notes, etc. -- I routinely assign tasks to others, and mark emails for followup (which then generates a reminder both in Outlook, and on my phone at the time I specify). Not to mention that we use Exchange 'Public Folders' for a ton of things.

I don't consider my wife a massive technogeek, by the way, and she has yet to ever get nailed by a piece of spyware, etc.

Steve