"Bharat Suneja [MSFT] 12 Apr 2011 2:27 PM # @Gus: ForeFront is not a part of Exchange - it's a separate product. You may need to follow similar procedures with any third-party products installed on the server.
Although doing so is possible technically, customers wouldn't want Exchange to touch other products or services installed on a server. "
Bharat - I understand what you're saying - that Exchange shouldn't interfere with other products installed, however, if the option is that the servers will become a very nice expensive bricks if the services are not disabled then the exchange team are neglecting the customer. The check for the service, it's status and the integration should, at the very least be included in the pre-requisites check with a straightforward message informing the admin how to clear the problem.
There is NO mention of this dance required to install a service pack or update in the technet library for Exchange 2010 - WHY? If the answer to that is "Well we've blogged about it and there is a wiki from the Forefront team" then your understanding of customer requirements are sadly lacking. As this is an important piece of information to enable successful deployment THE place for it is in the Exchange Documentation in the Technet library.
I'm all for Web 2.0, but I'm getting a little tired of having to ferrett around various blogs and wikis for technical documentation that should be in the library.