Aaron Vegh has written a piece at OSnews.com on Apple and the Enterprise. After talking about the problems that the Sassar worm caused for his employer, he says:

This isn't the first time that those widely-publicized Windows security issues have bitten this company. When you think of both man-hours trying to fix the problem, and the combined loss of productivity in a company this size, the cost must be amazing. So the question must be asked: how can this company -- indeed, any large corporation -- rationally choose to support a Windows infrastructure?

The answer is complicated, and has as much to do with inertia, ignorance and comfort level as it does with dollars and cents.

From The Apple of the Enterprise's Eye - OSNews.com
Referenced Mon May 17 2004 22:14:33 GMT-0600

Aaron then gives four reasons why Apple cannot compete in the enterprise in spite of the problems Windows faces:

1. Enterprise IT hates surprises
2. Apple does not have a dedicated enterprise sales force
3. Apple does not support dozens of enterprise applications
4. No ISV channel for enterprise applications

I don't think these reasons are far off. What's more, these same problems would largely apply to Linux as well. Selling to large corporations is a complicated business. Microsoft has it covered.