Excel & Word Password Recovery

[raja]

Maybe you are aware of h++p://www.decryptum.com
It mentions about itself:
"Decryptumtm is the first instant online Word and Excel password removal service. Decryption time is under 3 minutes, regardless of password length: you don't have to wait days for the file to be unprotected (all other services offer 2 to 14 days turnaround time). You don't have to download and install any software or spend your CPU time running a password recovery tool."

I have tested it with a long/uneasy/foreign-language characters password and it successfully decrypted it instantly - impressing.

My curiosity is: how they have done it and why still no software is available in market which can handle this task. Yes, many vendors along with the owners of decryptum.com are selling various password cracking software but all those are just try&error type.