Temporary deactivation of Symantec Endpoint Protection / Microsoft Exchange

We are running Windows Server 2008 with Small Business Server.  An upgrade of a branch-specific application recommends disabling anti-virus scanners during the application process (probably due to the risk of anti-virus interfering with the upgrade process).  We are using Symantec Endpoint Protection, which has the following services running:

Symantec Endpoint Protection
Symantec Endpoint Protection Manager
Symantec Endpoint Protection Manager Webserver
Symantec Endpoint Protection Start Program
Symantec Mail Security for Microsoft Exchange
Symantec Mail Security Management Service
Symantec Mail Security Utility Service

Which of these services would need to be stopped?  In which order?  Does the stopping of any of these services automatically stop any of the other ones?

We may also need to stop Microsoft Exchange.  Same questions as above, regarding the following services:
Active Directory Topology
Server Extension for Windows Server Backup
Anti-Spam Update
Data Delivery
Service Host
Information Storage manager
Mail transfer (Hub-Transport-Server)
Mailbox assistant
Data Replication
Search Indexing
System Monitor (for directory searches)
Transport Service
Transport Log Search
Exchange Diagnose Cmdlets

After the upgrade these services would need to be restored to their normal functionality.

Also up for consideration:  disconnect outside internet access while Symantec is deactivated, to reduce the risk of virus infection.

Any suggestions as to how to stop and subsequently restore Symantec and MS Exchange would be appreciated.
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Hypercat (Deb)Commented:
If your vendor is concerned about the antivirus software interfering with their installation process, all you need to do is stop the Endpoint Protection service.  It's the only one that will scan files as they are being written to the hard drive of the server.  To stop the Endpoint Protection service you need to go to the Run command or open a command prompt and type:

smc -stop  

After the installation is finished, go to the prompt again and type:  smc -start to restart the service.

The easiest way to stop all of the Exchange services is to stop the Microsoft Exchange Active Directory Topology Service.  This will stop all the other Exchange services except the information store and the Forms-Based authentication service.  However, when you run an Exchange rollup or update from Microsoft, it normally stops these services automatically.  I have, however, run into a few instances where it will hang when stopping the services, so it's probably just as well to stop them first before running the update.  I've run many Exchange updates on servers with Symantec installed and never had a problem.  I am, however, very careful to make sure that any files/folders related to the Exchange databases are excluded from scanning!!

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Windows Server 2008

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