I had the same problem with opening Hotmail for 3 days now and finally I've solved it.
I went to Calender underneath the Inbox button and cliced to previous month (June) and again back to Inbox button. Thats it. Problem solved.
Try this .....go click on "calender" the last tac under inbox.., and see if it opens which I think will, and then click on "mail" on top, and then "Inbox"..You should be able to use same way everytime u open it. If it does not work on Internet explorer , USE FIRE FOX... Works for me.... I also updated java......
People, have you tried go to Internet Explorer or Firefox (a better browser) and write www.hotmail.com on them or just look that on google. Once there, you just need to give your mail account address and bellow can put your password. Then just press the button that appears bellow.
Making that I can sure 100% that let all of you go to hotmail inbox. Messenger is not the only way to access to your mail account.
To all those already knows that, other answer: use GMAIL is much more useful and better than hotmail. Messenger? Just let Gmail get or your mail of Hotmail inbox to your Gmail Inbox.
I was suffering from same problem, upon hit and trial something worked for me.
When you place your mouse on the email you want to read, you will find an icon there which says "Mark this message as unread". I clicked on that once which made the mail to go read and clicked it again to make it unread. That worked as a charm as I was able to do things on Hotmail.