Since upgrading to Windows 8.1 on 10/26/2013, when logging into my email account (@live.com) from the Bing bar, there is an error message in red stating "This account does not have a valid username and password", below where my @live.com is. I have no problem getting or reading my mail. When installing Windows 8.1 I had to change my password at least 6 different times before it took. A tech from Microsoft was even on my system for 2 hours trying to figure out what was going on, but later informed me that he was not familiar with the email portion of Microsoft.