I should say I still really like Exchange, a crippled OWA in browsers other than IE is really a minor niggle. It's pretty solid, very configurable, and generally coupled with an Outlook client causes few support issues.
The whole point of the "web access" interface of Outlook is to allow people from mobile environments to access their mail (such as telework). It's not a replacement for the Outlook client.
Again, jav has no idea what his talking about. His not a "corporate" person therefore his responses are nothing more than pro-linux crap.