I use IE, Firefox & Chrome on my PC.  Why do outlook crashes Internet Explorer 9 & 10, but it doesn't happen with Firefox and Chrome?  This has been an issue for me and many others (as noticed on online messages and forums) since its introduction; and it seems that Outlook can't sort it, in spite of all the complaints.  I spent many hours trying everything to sort it, with advice from Outlook and other online messages/forums!  And the thing is; one can't revert to Hotmail!  This is stupid!!!  Outlook should sort this issue; or make it so that people can revert back to Hotmail, at least until this issue/fault is solved!  Get your act together Outlook!!!  Or, maybe I should use another mail client like Yahoo, Google, etc.