How can I troubleshoot not being able to login to OWA?

There could be many reasons why you are not able to login to OWA.  Here is a list of things to check: 
  1. Check the OWA address is correct
    When incorrect, you may see a page cannot be found or Internet Explorer cannot display the webpage error.  You will also not see the login screen or prompt
  2. Check your username and password
    When incorrect, you will be prompted to re-enter your password several times in a row without getting access to your mailbox.  After three tries you will see an error indicating that you are not authorized.
  3. Try accessing OWA using a different browser
    If you cannot get into OWA, try connecting to OWA using another browser.  For example, if you are using Internet Explorer, try using Firefox or Netscape and visa versa.
  4. Try accessing OWA using a different computer
    Go to another computer and try logging into OWA using your account, Can you connect?
  5. Ask you coworkers if they can connect to OWA
    Check with the people around you to see if they are also having problems.
  6.  Document any errors you get and provide all the information to your Corporate Help Desk or Exchange Administrator for assistance
    To take a screenshot of any errors you get by pressing the “Print Screen” button on your keyboard.  Once you press the print screen button the picture will be on your clipboard.  Open a Microsoft Word document, right-click on the whitespace and press Paste

    Gather up as much information about what you are seeing so that you can provide it to your Help Desk or System Administrator.