I LIKE Microsoft products. But if I was doing IT for a government that had legitimate concerns about security, I would use Linux and other open source products, and I would be very careful about auditing every bit of code used in my networks. And I would monitor my firewalls (also open source) very carefully. And I would set up a "honeynet" to snag foreign 3l33t HaX0rz. And I would generate lots of disinformation.
And I would still worry. But using closed-source systems in sensitive government work is just nuts.
"But using closed-source systems in sensitive government work is just nuts."
Spoken like someone who hasn't been there.