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Also check<br />
<a href="http://support.microsoft.com/kb/837285/en-us" rel="ugc nofollow">http://support.microsoft.com/kb/837285/en-us</a>
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Also check
http://support.microsoft.com/kb/837285/en-us [http://support.microsoft.com/kb/837285/en-us]

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Refer this as well:<br />
<br />
<a href="https://www.experts-exchange.com/questions/21846380/http-1-1-503-service-unavailable-in-OWA-2003.html" rel="ugc">https://www.experts-exchange.com/questions/21846380/http-1-1-503-service-unavailable-in-OWA-2003.html</a>
</div>


Refer this as well:

https://www.experts-exchange.com/questions/21846380/http-1-1-503-service-unavailable-in-OWA-2003.html [https://www.experts-exchange.com/questions/21846380/http-1-1-503-service-unavailable-in-OWA-2003.html]

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<div class="content wysiwyg-content">
I have Server 2003/ Exchange 2003 and when we try to use OWA we get ther error, &nbsp;- HTTP/1.1 503 Service Unavailable<br />
<br />
Paul
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I have Server 2003/ Exchange 2003 and when we try to use OWA we get ther error,  - HTTP/1.1 503 Service Unavailable

Paul

OWA message -  HTTP/1.1 503 Service Unavailable

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.