If you are seriously claiming that Exchange and Google Apps provide the same features except for the most basic, one-sentence description of those features (as

If you are seriously claiming that Exchange and Google Apps provide the same features except for the most basic, one-sentence description of those features (as in, 'they both send mail and store contacts'), you clearly don't have the slightest idea of what Exchange is or does. Regarding the BI, I think you're mistaking me for another person in this thread, I don't know much about that, nor do I have an opinion. I'm just saying that Exchange is unique and there is nothing out there that can replace it without making very different trade-offs in the way your IT infrastructure is set up.