M$ IE cookie blocking
If the M$ IE (IE6, IE7, IE8) web browser cant find a P3P cookie 'privacy policy' for your website it might 'block' your cookies unless the user has chosen the 'Always allow this site to use cookies' option.
See also:
- http://www.cookiecentral.com/faq/#4.6
- http://www.p3pwriter.com/LRN_000.asp
- http://www.website-law.co.uk/privacypolicy.html
- http://www.bbc.co.uk/privacy/our-privacy-policy.shtml