Let us see how to change the Outlook web app(OWA) Logon page in Exchange 2013

All the Outlook Web App logon page /Themes are stored in the Client Access Server

 

Browse to the Following Location in your Client Access Server

C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\Owa Auth\15.0.516\themes\Resources

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Or

Open IIS Manager

Server\Sites\DWS\OWA\Auth\<Version>\Themes\Resources

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Every .gif and .png file inside this folder serves its own purpose

Am going to customize a little which is more adequate to place company logos

 

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For Example :

Take a backup of the files before editing

Am Going to Edit owa_Text_Blue.png and Olk_logo_White.png

Just edited it and replaced the files in the below location
C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\Owa Auth\15.0.516\themes\Resources

Now have a Look at my Customized OWA page

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转自:http://www.careexchange.in/how-to-customize-the-outlook-web-app-owasign-in-page-in-exchange-2013/