.COM is a "thin" TLD (top level domain), meaning that very few details are registered at the actual Network Information Centre (NIC, the place that administrates the TLD).
www.who.is gives the following for microsoft.com, no mention of who actually owns it, you can try your own domains:
Domain Name:
microsoft.com
Status: clientDeleteProhibited, clientTransferProhibited, clientUpdateProhibited
Registrar: TUCOWS INC.
Whois Server: whois.tucows.com
Referral URL:
http://domainhelp.opensrs.net
Expiration Date: 2014-05-03
Creation Date: 1991-05-02
Last Update Date: 2006-10-10
Name Servers:
ns1.msft.net
ns2.msft.net
ns3.msft.net
ns4.msft.net
ns5.msft.net