If you have Outlook Web Access on your server, why not just use that for instant gratification and set your Mail application to grab it all via (Typo: IMAP) every couple minutes?
The idea that setting a one minute mail retrieval time is inadequate has always seemed absurd to me. Email is not instantaneous, and depending on network conditions, can take several minutes to get to your email server in the first place; . You should never rely on non-realtime communication methods for things that require immediate response. Use the phone or IM if it's that important.
As a busy professional, I feel I'm qualified to say, "chill out." The extra 30 seconds to get that email message are not going to kill you. I guess I don't see the advantage of push email. There are so many other improvements that could have been made to make the experience better.
