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Solution worked i only had to delete the registry entry's the isapa was not installed so i installed rebooted and it worked 

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I am getting this error when trying to install client access role for my exchange server 2010 
can anyone help 
Summary: 3 item(s). 1 succeeded, 1 failed. 
Elapsed time: 00:00:04 
 
 
Preparing Setup 
Completed 
 
Elapsed Time: 00:00:00 
 
 
Client Access Role 
Failed 
 
Error: 
The following error was generated when &quot;$error.Clear(); $InternalOwaUrl=&quot;<a href="https://" rel="ugc nofollow">https://</a>&quot; + $RoleFqdnOrName + &quot;/owa&quot;; new-OwaVirtualDirectory -DomainController $RoleDomainController -InternalUrl $InternalOwaUrl;&quot; was run: &quot;An error occurred while creating the IIS virtual directory 'IIS://DENCOFAM.denco-enterprises.com/W3SVC/1/ROOT/owa' on 'DENCOFAM'.&quot;. 
 
An error occurred while creating the IIS virtual directory 'IIS://test.testserver.com/W3SVC/1/ROOT/owa' on 'test'. 
 
ISAPI extension owaauth.dll in group MSExchangeClientAccess wasn't found and its status can't be changed. Please make sure this ISAPI extension (IIS Web service extension) is still listed in IIS Manager. If it's not, it may need to be added again. 
 
Elapsed Time: 00:00:03 
 
 
Finalizing Setup 
Cancelled
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I am getting this error when trying to install client access role for my exchange server 2010
can anyone help
Summary: 3 item(s). 1 succeeded, 1 failed.
Elapsed time: 00:00:04


Preparing Setup
Completed

Elapsed Time: 00:00:00


Client Access Role
Failed

Error:
The following error was generated when "$error.Clear(); $InternalOwaUrl="https://" + $RoleFqdnOrName + "/owa"; new-OwaVirtualDirectory -DomainController $RoleDomainController -InternalUrl $InternalOwaUrl;" was run: "An error occurred while creating the IIS virtual directory 'IIS://DENCOFAM.denco-enterprises.com/W3SVC/1/ROOT/owa' on 'DENCOFAM'.".

An error occurred while creating the IIS virtual directory 'IIS://test.testserver.com/W3SVC/1/ROOT/owa' on 'test'.

ISAPI extension owaauth.dll in group MSExchangeClientAccess wasn't found and its status can't be changed. Please make sure this ISAPI extension (IIS Web service extension) is still listed in IIS Manager. If it's not, it may need to be added again.

Elapsed Time: 00:00:03


Finalizing Setup
Cancelled

Solution worked i only had to delete the registry entry&#39;s the isapa was not installed so i installed rebooted and it worked 


Instlling exchange server 2010 client access roles

I am getting this error when trying to install client access role for my exchange server 2010
can anyone help
Summary: 3 item(s). 1 succeeded, 1 failed.
Elapsed time: 00:00:04


Preparing Setup
Completed

Elapsed Time: 00:00:00


Client Access Role
Failed

Error:
The following error was generated when &quot;$error.Clear(); $InternalOwaUrl=&quot;https://&quot; + $RoleFqdnOrName + &quot;/owa&quot;; new-OwaVirtualDirectory -DomainController $RoleDomainController -InternalUrl $InternalOwaUrl;&quot; was run: &quot;An error occurred while creating the IIS virtual directory &#39;IIS://DENCOFAM.denco-enterprises.com/W3SVC/1/ROOT/owa&#39; on &#39;DENCOFAM&#39;.&quot;.

An error occurred while creating the IIS virtual directory &#39;IIS://test.testserver.com/W3SVC/1/ROOT/owa&#39; on &#39;test&#39;.

ISAPI extension owaauth.dll in group MSExchangeClientAccess wasn&#39;t found and its status can&#39;t be changed. Please make sure this ISAPI extension (IIS Web service extension) is still listed in IIS Manager. If it&#39;s not, it may need to be added again.

Elapsed Time: 00:00:03


Finalizing Setup
Cancelled

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.

Exchange

Microsoft server applications are those applications developed specifically, but not necessarily exclusively, on the Windows Server platform. In addition to well-known products like SQL Server, Exchange, Internet Information Services (IIS), Microsoft Dynamics, Forefront, Lync and Sharepoint, they include applications like Skype, BizTalk, Hyper-V, Groove and Commerce Server. Server applications are managed with the Microsoft System Center.