Microsoft Exchange 2010 Client Access Server (CAS) Not Present in Site

Users are unable to access Microsoft Exchange 2010 mailbox resources

At least one Client Access Server (CAS) role matching the Exchange Mailbox Server version can not be�found in the site.

If a site contains servers that are running Microsoft Exchange Server 2010, at least one Exchange 2010 server must be running the CAS server role.To resolve this issue, verify that at least one Exchange 2010 CAS server is available.

For more information on this topic, including a step by step resolution, see the following document from Microsoft TechNet online:

At Least One Exchange 2010 CAS Server Must Be Present
http://technet.microsoft.com/en-us/library/gg263432(EXCHG.80).aspx

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