For the life of me I can't understand paying another business money to do what I can easily do just fine myself without overtaxing my staff. If you setup Exchange properly with the right policies in place all you really have to do is just monitor logs.
Exchange is one of the easiest things to setup and configure. Sure, CALs can be expensive if you don't have it and have to move everyone to Exchange but you don't have to purchase Outlook. Hell OWA and OMA come with it. Turn on Forms-Based Authentication if you want your pretty little logo on the login page and away you go.
I hate the world of cloud computing, managed networks, outsourced support, etc... Do it yourself, save the company a boat load, and get a nice bonus at the end of the year for your hard work.
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