To ensure that FPE is fully restarted, it is recommended that you stop and then restart all relevant Microsoft Exchange and Microsoft Forefront Server Protection services.
To restart the services-
Open Services Control Manager.
On Windows Server 2003, click Start, click Administrative Tools, and then click Services.
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Stop all relevant Microsoft Exchange services. Typically, this includes the Microsoft Exchange Transport and Microsoft Exchange Information Store services.
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Stop all relevant Microsoft Forefront Server Protection services. Typically, this includes the Microsoft Forefront Server Protection Controller service.
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Wait for all services to complete shutting down.
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Optionally, use Task Manager to end any FPE processes that are still running.
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In Services Control Manager, start all relevant Microsoft Exchange services.
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Start all relevant Microsoft Forefront Server Protection services.