Your account status appears next to your account picture and lets your Outlook.com and Skype contacts know whether you are available to chat or have a Skype call. You can change your account status in Outlook.com or Skype, but each time you sign in to Outlook.com, your account status will be reset to Available.
We are working on a fix, but in the meantime, you can prevent your status from changing by not signing out of Outlook.com. Note that closing your browser is not the same as signing out, and has no effect on your status.
To stay signed in when closing your browser, select the Keep me signed in box at the sign in prompt.
Note: Do not select Keep me signed in if you are using a public or shared computer.