Security ‎( show explanation )‎

The light version of Outlook Web App includes fewer features. Use it if you're on a slow connection or using a computer with unusually strict browser security settings. We also support the full Outlook Web App experience on some browsers on Windows, Mac, and Linux computers. To check out all the supported browsers and operating systems, click here.

If you chose to forward your OSU email to an external source such as Yahoo or Hotmail, you do not have an Exchange Mailbox and are unable to use Outlook Web Access. If you would like to use Outlook Web Access, you must use an Exchange mailbox. Login to, go to the Email Destination page, select 'O-Key / Exchange' as your email system, and click Save.