hi, can any body tell me that UUUQ server is based on Linux or Windows ...

Linux

Cool!

i want to send an email on registering a new user on my site as like many sites ... but i m not getting email coz mail is not successful i have debug ... there is some issue in sending email ... plz help me out in this issue ... thanks

The mail() function is disabled to discourage spammers. You can have it enabled for $10. Talk to Jack on the IRC.

swordz