Microsoft made such a call earlier this year, after researchers at Core Security informed the company that they had found a vulnerability in the Microsoft Virtual PC software.

FORBES: How Bad Assumptions Are Making Software Less Secure

This problem was especially thorny for Microsoft because Virtual PC allows Windows 7 users to run applications designed for older Windows versions in a virtualized environment on their Windows 7 machines.

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Both the VMWare Server and Microsoft's Virtual PC 2007 are ideal for installing virtual machines on an Intel- or AMD-based PC.

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Of course if Windows isn't your cup of tea, then you can also install Microsoft's DOS on your Mac using Virtual PC.

FORBES: Magazine Article