It's a shame that people in a single user environment have no clue what a problem not having a true Exchange client is in the business world. Yes, if you only have to check your own email entourage is fine on an exchange server. Please do not confuse being able to collect your email with being a true Exchange client.
In a business environment Exchange is not used simply for email. It's a business tool for sharing information among hundreds/thousands/tens of thousands of users.
My company posts calendars of meetings scheduled for several conference rooms and a conference center in the public folders. entourage cannot access calendars in public folders. we cannot use the built in group scheduling and invitation function that is essential in a business environment.
departments that have to monitor shared email boxes cannot add those boxes to their primary account: entourage does not support this feature which has been in Outlook for at least five years.

do not fixate on the usefulness of products in a single user environment and then put down those of us that have deal-breaking problems because we need this to function as a business tool. i'm glad the product works for your very limited need but it is forcing me to replace macs with PCs. isn't that the ultimate in product failure for those of us that want to use macs in the workplace? it's terribly frustrating for me to have one damn program undermine my plans to keep my workplace primarily mac. those days are now over for me. :P