Fully customizable? Didn't you say that if you wanted a browser with addons you would choose firefox? Does opera support addons?

First, I didnt claim to have all the answers nor will I ever, however I do know that the army uses outlook to its potential and I know for a fact that thunderbird would not suite the needs of the army. Just because most of these tbird users dont like outlook and hate anything microsoft on principle of it being anti-OSS, doesnt mean that they are right in any aspect. Your comment about disabling email in outlook shows your total lack of knowledge about how a business is run. No business in their right mind would spend money on something, then disable its primary function to use a third party product which is best suited for a niche of users at best. I use thunderbird, however, I dont try to pretend its something its not (as is the case with most of the firefox/tbird fanatics). You claim that its microsoft's problem that t-bird doesnt interface with exchange. Can you explain then, why several other email clients CAN interface with it? Can you explain why the API's exist to allow other clients to interface with it and have been in use for several years?