In some instances, organizations may want to put their logo and logon page on Outlook Web Access. Now it is easy to customize Microsoft Outlook Web Access by using your organization's logo and colors. Customizing Outlook Web Access is a great way to help build an identity for your organization into a tool on which many users rely and to impress your users and management.
The following article shows you how to customize the logon, language selection, and logoff pages, and how to create a theme by using a custom header.
Customizing the Look of Outlook Web Access