Up to now we have been pushing mails to personal gmail/yahoo accounts so that users could access their email on mobile devices. We have been using the Forward-To Delivery Option.
Now we have ActiveSync working in Exchange Server 2010 so users can take advantage of it for mobile devices. ActiveSync will be a much better experience for the users but is there any IT benefit in getting users off push-email? (apart from a relatively minor saving in server storage space)
Pros of keeping your email in-house:
Cons:
IMO it's worth it.