I use either IE8 or Chrome and outlook.com was working fine.  A couple of weeks ago I started having a problem with the drop down menus - they were not available when selected.  Today I deleted the cache, cookies, and browsing histories in both IE8 and Chrome.  The problems now are:

IE8 - can not open email messages - there is flickering between the cursor and hourglass for a while  before it settles down - I can highlight the message but it won't open; also 'error on page' displays on bottom status screen; but the drop down menus are working.

Chrome - can open the messages but the drop down menus do not work.

Also, previously IE8 would not autofill my username but Chrome would.  Now neither autofills.