Installation Notes and Reminders:
You do not need to stop or start Microsoft Exchange services before or after the installation.
If information from a previous Messaging Security Agent installation exists on the client, you will be unable to install Messaging Security Agent successfully. Use the Windows Installer Cleanup Utility to clean up remnants of the previous installation. To download the Windows Installer Cleanup Utility, visit:
http://support.microsoft.com/kb/290301/en-usIf you are installing the Messaging Security Agent on a server that is running lockdown tools, remove the lockdown tool so that it does not disable the IIS service and causes the installation to fail.
The Messaging Security Agent can also be installed during the installation of the Security Server. For details, see the Installation and Upgrade Guide.
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The Messaging Security Agent does not support some Microsoft Exchange Server Enterprise features such as data availability group (DAG).