The scanner update settings are, by default, set to begin updating your engines five minutes after the FSCController is started. For more information about configuring scanning options, see Transport Scan Job, Realtime Scan Job, and Manual Scan Job.
If you are using a proxy server to access the Internet for scanner updates, these scheduled updates will fail.
The engine for Cloudmark isn’t updated very often, because it uses online signatures.
The engine only need to be updates when there are some changes in it, like a new version.
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Setting a schedule for checking the HTTP or Exchange server for a new scan engine means that you are automatically protected against new viruses without having to check versions or manually update the files.You can modify the four additional engine selections through the Forefront Server Security Administrator.After Forefront Security for Exchange Server is installed, engine updates automatically begin.Hence, you must exclude the site the from HTTPS inspection.Follow the steps here Cloudmark engine is the best protection you can have against spam and hence it is important to make sure that you run with the latest micro updates!