- My Linux is able to telnet to my ISP's pop3 & smtp respective ports
- My Win2k (fired under WMWare) is not able to telnet to my ISP's pop3 &
smtp respective ports, though it can ping them without problem. And web
browsing is fine. 
- This seems not be the WMWare's problem, because my new grml0.8 launched
within WMWare can telnet to my ISP's pop3 & smtp respective ports without
problem. 
- I've done some homework about Win2k ports blocking, and have verified
that my TCP/IP filtering & IPSec is not used. 
- The Win2k is out-of-box vanilla SP4, with bare minimum configuration, no
firewall or anti-virus SW.