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Opportunity cost is the cost of passing up one investment in favor of another.
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Here you go.... Investment one is in Fox. Investment two is in dotNET.

I contend there is zero opportunity cost in passing up an investment in Fox for an investment in dotNET. I contend there is little to no marginal utility in Fox-related investments as far as training, R & D, etc.

Therefore, zero opportunity cost is possible. i.e., I give up nothing in Fox if I invest in dotNET.

Now, if you compare dotNET to Java, maybe there is opp cost there.. But then again, that was not my argument...

BTW, anybody can regurgitate a textbook definition of opportunity cost and present it as his own thought....< s >.