You clear your cache every day? I do it like... once a quarter, if that! :-)
They constantly change the frontpage security for hotmail. But if you bookmarked it, after it loaded the page, you likely included a SID or something in the URL (which will change durign each session). Best way to deal with that, is go into the favourites menu..... right-click your hotmail favourite and hit properties. Then in the URL window, just type in
http://www.hotmail.co.uk or .com or whatever. By doing this, the address will forward to wherever Microsoft have decided to move it to this time! :-)
Can't see any other reason you'd get issues with it tho.