I've read many posts/articles comparing Google Apps to Outlook, Exchange, Hosted Exchange, etc.
My only real concern/question is how does Outlook work with Google when you have a large mailbox (2-4 GB) or a "huge" mailbox (5-15 GB).
That's my biggest issue/problem right now with a few clients. They all love that Google advertises a 25 GB limit, but i know Outlook just doesn't do well with that much data. With exchange we're looking at massive OST files. Using the Google sync add-in, does outlook also make an OST or similar file? Does it have just as many problems as Exchange with a mailbox that large?
Of course I know if you avoid Outlook and stick to just the Gmail web interface you're fine, but most end users want to keep Outlook.