We have 37 sites with CAS servers and would like to know how to configure or separate the Internal and External OWA access?

In what way? You haven't provided enough detail on what you want to do, versions involved or anything that can provide assistance on what you want to do. Based on the information you have provided at this time all I can say is look on Technet. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.

We are using Exchange 2007. Each 37 sites has a CAS server. Is there a way to configure this centrally giving the users 1 URL for internal access and 1 URL for external access. The reason for the internal and external access is to prevent attachment download for external access only.

It is a per server setting. The only way to do it centrally would be to get the command to change it from Technet, then use it with a piped get-clientaccessserver | set-clientaccessserver type command so that the script makes the same change on all servers. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.

Can you provide an example command?

Hi Lascano, Please run the cmdlet Get-ClientAccessServer | Get-OwaVirtualDirectory | Set-OwaVirtualDirectory -InternalUrl https://mail.contoso.com/owa -WhatIf . If the results is as expected, remove the -whatif. If it doesn't work, you can add the foreach syntax. e.g. Get-ClientAccessServer | Get-OwaVirtualDirectory | foreach {Set-OwaVirtualDirectory -Identity $_.name -InternalUrl https://mail.contoso.com/owa} Frank Wang TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

thanks for the sample command. i will try it and set it for all CAS servers.

Hi Lascano, Any updates?Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.