Outlook on the web (formerly known as Outlook Web App or Outlook Web Access) is a browser-based email client. Outlook on the web lets you access your Microsoft Exchange Server mailbox from almost any web browser.

If you have installed Exchange in your organization, you have the option of customizing the Exchange Outlook on the Web Sign in Page to provide a corporate look and feel to your end users. In this blog post, we’re going to customize the Outlook on the Web Sign in page for our users.

WHAT CAN WE CUSTOMIZE?

Microsoft gives you the following options to customize the sign in page for your organization.

Outlook Web Access Login Page
ImageFile nameLocation
1favicon.ico%ExchangeInstallPath%FrontEnd\HttpProxy\owa\auth\<ExchangeVersion>\themes\resources
2olk_logo_white.png%ExchangeInstallPath%FrontEnd\HttpProxy\owa\auth\<ExchangeVersion>\themes\resources
3owa_text_blue.png%ExchangeInstallPath%FrontEnd\HttpProxy\owa\auth\<ExchangeVersion>\themes\resources
4Sign_in_arrow.png (for left-to-right languages)

Sign_in_arrow_rtl.png (for right-to-left languages)
%ExchangeInstallPath%FrontEnd\HttpProxy\owa\auth\<ExchangeVersion>\themes\resources

You can customize the color and images of these pages. These pages are based on CSS files in your exchange installed directories. Once you modify the CSS file for these pages it will be reflected to the users in the organization.

Make sure you back up the files you customize, before you edit them.

MODIFYING CSS FILES

It’s possible to modify the sign in page further than just replacing images. With some CSS knowledge, this page can be significantly changed.

We’re able to modify the CSS files located here:

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