Windows XP is by many critrerias still better than any newer Microsoft OS. It is fast, takes less resources (RAM), supports more devices, can run more applications. Windows XP is actualy so good OS that Microsoft actualy needs to shut it down in order to make people buy new HW and OS. Security is only excuse they have.

This looks like conspiracy theory but still. XSL attack. http://en.wikipedia.org/wiki/XSL_attack Bruce Schneier and Niels Ferguson write, "We have one criticism of AES: we don't quite trust the security What concerns us the most about AES is its simple algebraic structure No other block cipher we know of has such a simple algebraic representation. We have no idea whether this leads to an attack or not, but not knowing is reason enough to be skeptical about the use of AES." (Practical Cryptography, 2003, pp56–57)

As far as i know this holds mostly for POSIX based operating systems, (Portable Operating System Interface) and some UNIX executables from 70' can still run on todays Linux. Do i have any gauarntee that my apllication writen on .NET today, will run at least 15 years later on Window 2030?