After you have configured the on-demand scan and selected which mailboxes to scan, you can run the on-demand scan immediately.
To run the on-demand scan immediately-
In the Forefront Protection 2010 for Exchange Server Administrator Console's Tasks view, in the tree, expand Task Library, and then click Mailbox On-Demand.
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In the Task Library - Mailbox On-Demand pane, in the Actions section, click Start On-Demand Scan. This sets the start time to the current time, thus starting the scan.
Note: To stop an on-demand scan that is running, in the Actions section, click Stop On-Demand Scan. To suspend a running on-demand scan, in the Actions section, click Suspend On-Demand Scan. To resume a suspended on-demand scan, in the Actions section, click Resume On-Demand Scan. Clicking Resume On-Demand Scan starts a suspended scan from where it left off; however, if you click Start On-Demand Scan when a scan has been suspended, the scan starts from the beginning again. You do not need to click Save to start or stop an on-demand scan.
After running the on-demand scan, you can use the Forefront Management Shell to check its status.
To check scan status-
Click Start, point to All Programs, point to Microsoft Forefront Server Protection, and then click Forefront Management Shell.
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Enter the following Windows PowerShell command:
Get-FseOnDemandScan -status
The status can be ACTIVE, STOPPED, or SUSPENDED. A status of ACTIVE indicates that the scan is still running, STOPPED indicates that it has completed, and SUSPENDED indicates that it was paused.