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Indicates whether to check for new virus and spyware definitions before Windows Defender runs a scan.
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If you specify a value of $True, Windows Defender checks for new definitions.
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If you specify a value of `$True`, Windows Defender checks for new definitions.
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If you specify `$False` or don’t specify a value, the scan begins with existing definitions.
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This value applies to scheduled scans, but it doesn’t affect scans that you start from the user interface or to scans that you start from the command line.
Runs the cmdlet in a remote session or on a remote computer.
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Enter a computer name or a session object, such as the output of a [New-CimSession](https://go.microsoft.com/fwlink/p/?LinkId=227967) or [Get-CimSession](https://go.microsoft.com/fwlink/p/?LinkId=227966) cmdlet.
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The default is the current session on the local computer.
Indicates whether Windows Defender runs catch-up scans for scheduled full scans.
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A computer can miss a scheduled scan, usually because the computer is turned off at the scheduled time.
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If you specify a value of $False, after the computer misses two scheduled full scans, Windows Defender runs a catch-up scan the next time someone signs in the computer. If you specify a value of $True, the computer doesn’t run catch-up scans for scheduled full scans.
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If you specify a value of `$False`, after the computer misses two scheduled full scans, Windows Defender runs a catch-up scan the next time someone signs in the computer. If you specify a value of `$True`, the computer doesn’t run catch-up scans for scheduled full scans.
Indicates whether Windows Defender runs catch-up scans for scheduled quick scans.
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A computer can miss a scheduled scan, usually because the computer is off at the scheduled time.
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If you specify a value of $False, after the computer misses two scheduled quick scans, Windows Defender runs a catch-up scan the next time someone signs in the computer. If you specify a value of $True, the computer doesn’t run catch-up scans for scheduled quick scans.
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If you specify a value of `$False`, after the computer misses two scheduled quick scans, Windows Defender runs a catch-up scan the next time someone signs in the computer. If you specify a value of `$True`, the computer doesn’t run catch-up scans for scheduled quick scans.
Indicates whether Windows Defender parses the mailbox and mail files, according to their specific format, in order to analyze mail bodies and attachments.
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Windows Defender supports several formats, including .pst, .dbx, .mbx, .mime, and .binhex.
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If you specify a value of `$False` or don’t specify a value, Windows Defender performs email scanning. If you specify a value of $True, Windows Defender doesn’t perform email scanning.
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If you specify a value of `$False` or don’t specify a value, Windows Defender performs email scanning. If you specify a value of `$True`, Windows Defender doesn’t perform email scanning.
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This configuration isn’t applicable to modern email clients.
Indicates whether to scan for malicious and unwanted software in removable drives, such as flash drives, during a full scan.
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If you specify a value of `$False` or don’t specify a value, Windows Defender scans removable drives during any type of scan. If you specify a value of $True, Windows Defender doesn’t scan removable drives during a full scan. Windows Defender can still scan removable drives during quick scans or custom scans.
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If you specify a value of `$False` or don’t specify a value, Windows Defender scans removable drives during any type of scan. If you specify a value of `$True`, Windows Defender doesn’t scan removable drives during a full scan. Windows Defender can still scan removable drives during quick scans or custom scans.
Indicates whether to scan mapped network drives. If you specify a value of `$False` or don’t specify a value, Windows Defender scans mapped network drives. If you specify a value of $True, Windows Defender doesn’t scan mapped network drives.
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Indicates whether to scan mapped network drives. If you specify a value of `$False` or don’t specify a value, Windows Defender scans mapped network drives. If you specify a value of `$True`, Windows Defender doesn’t scan mapped network drives.
Indicates whether to scan for network files. If you specify a value of `$False` or don’t specify a value, Windows Defender scans network files. If you specify a value of $True, Windows Defender doesn’t scan network files. We don’t recommend scanning network files.
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Indicates whether to scan for network files. If you specify a value of `$False` or don’t specify a value, Windows Defender scans network files. If you specify a value of `$True`, Windows Defender doesn’t scan network files. We don’t recommend scanning network files.
Specifies file-share sources for definition updates.
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Specify sources as a bracketed sequence of Universal Naming Convention (UNC) locations, separated by the pipeline symbol; for example, { \\\\Server01\Share01 | \\\\Server02\Share02 | \\\\Server03\Share03}.
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Specify sources as a bracketed sequence of Universal Naming Convention (UNC) locations, separated by the pipeline symbol; for example, `{ \\\\Server01\Share01 | \\\\Server02\Share02 | \\\\Server03\Share03}`.
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If you specify a value for this parameter, Windows Defender attempts to connect to the shares in the order that you specify.
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After Windows Defender updates a definition, it stops attempting to connect to shares on the list.
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If you don’t specify a value for this parameter, the list is empty.
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