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Check the host headers in IIS, to make sure it's pointing to port 80.<br />
You can use KB312422: <a href="http://support.microsoft.com/default.aspx?scid=kb;en-us;312422" rel="ugc">http://support.microsoft.com/default.aspx?scid=kb;en-us;312422</a><br />
&nbsp;to do that.<br />
Do you have more than one smtp address for those users ?<br />
Verify you recipient serivces pointing to the right DC, if you have more than one try to change it, rebuild and update the RUS.<br />
<br />
Alex.
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Check the host headers in IIS, to make sure it's pointing to port 80.
You can use KB312422: http://support.microsoft.com/default.aspx?scid=kb;en-us;312422 [http://support.microsoft.com/default.aspx?scid=kb;en-us;312422]
 to do that.
Do you have more than one smtp address for those users ?
Verify you recipient serivces pointing to the right DC, if you have more than one try to change it, rebuild and update the RUS.

Alex.

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Problem lies somewhere with the AD attributes. &nbsp;Error message is received within Active Directory Users and Computers when trying to enable the Exchange Feature &quot;&nbsp;OWA&quot;. &nbsp;Enable or Disable OWA works for all accounts except 2. &nbsp;The error message is received when trying to apply property changes within Active Directory Users and Computers.
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Problem lies somewhere with the AD attributes.  Error message is received within Active Directory Users and Computers when trying to enable the Exchange Feature " OWA".  Enable or Disable OWA works for all accounts except 2.  The error message is received when trying to apply property changes within Active Directory Users and Computers.

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Thanks, &nbsp;works either by editing the key or deleting http and https.
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Thanks,  works either by editing the key or deleting http and https.

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I'm have tried enabling OWA per user from within ADUC. &nbsp;When I click apply after enabling OWA I receive the error that the directory service attribute or value already exists and OWA remains disabled. &nbsp;Error code is 8007200d. &nbsp;Any help would be appreciated.
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I'm have tried enabling OWA per user from within ADUC.  When I click apply after enabling OWA I receive the error that the directory service attribute or value already exists and OWA remains disabled.  Error code is 8007200d.  Any help would be appreciated.

Exchange 2003, Enabling OWA per user

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.