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This policy setting allows you to specify an interval at which to check for definition updates. The time value is represented as the number of hours between update checks. Valid values range from 1 (every hour) to 24 (once per day). If you enable this setting checks for definition updates will occur at the interval specified. If you disable or do not configure this setting checks for definition updates will occur at the default interval.

This policy setting allows you to define the number of days after which a catch-up definition update will be required. By default the value of this setting is 1 day. If you enable this setting a catch-up definition update will occur after the specified number of days. If you disable or do not configure this setting a catch-up definition update will be required after the default number of days.

This policy setting allows you to configure the antimalware service to receive notifications to disable individual definitions in response to reports it sends to Microsoft MAPS. Microsoft MAPS uses these notifications to disable definitions that are causing false positive reports. You must have configured your computer to join Microsoft MAPS for this functionality to work. If you enable this setting or do not configure the antimalware service will receive notifications to disable definitions. If you disable this setting the antimalware service will not receive notifications to disable definitions.

This policy setting allows you to specify the time of day at which to check for definition updates. The time value is represented as the number of minutes past midnight (00:00). For example 120 (0x78) is equivalent to 02:00 AM. By default this setting is configured to check for definition updates 15 minutes before the scheduled scan time. The schedule is based on local time on the computer where the check is occurring. If you enable this setting the check for definition updates will occur at the time of day specified. If you disable or do not configure this setting the check for definition updates will occur at the default time.

This policy setting allows you to specify the day of the week on which to check for definition updates. The check can also be configured to run every day or to never run at all. This setting can be configured with the following ordinal number values:(0x0) Every Day (default)(0x1) Sunday (0x2) Monday(0x3) Tuesday(0x4) Wednesday(0x5) Thursday(0x6) Friday(0x7) Saturday(0x8) NeverIf you enable this setting the check for definition updates will occur at the frequency specified. If you disable or do not configure this setting the check for definition updates will occur at a default frequency.

This policy setting allows you to enable real-time definition updates in response to reports sent to Microsoft MAPS. If the service reports a file as an unknown and Microsoft MAPS finds that the latest definition update has definitions for a threat involving that file the service will receive all of the latest definitions for that threat immediately. You must have configured your computer to join Microsoft MAPS for this functionality to work. If you enable or do not configure this setting real-time definition updates will be enabled. If you disable this setting real-time definition updates will disabled.

This policy setting allows you to enable download of definition updates from Microsoft Update even if the Automatic Updates default server is configured to another download source such as Windows Update. If you enable this setting definition updates will be downloaded from Microsoft Update. If you disable or do not configure this setting definition updates will be downloaded from the configured download source.

This policy setting allows you to define the order in which different definition update sources should be contacted. The value of this setting should be entered as a pipe-separated string enumerating the definition update sources in order. Possible values are: “InternalDefinitionUpdateServer” “MicrosoftUpdateServer” “MMPC” and “FileShares”For example: { InternalDefinitionUpdateServer | MicrosoftUpdateServer | MMPC }If you enable this setting definition update sources will be contacted in the order specified. Once definition updates have been successfully downloaded from one specified source the remaining sources in the list will not be contacted. If you disable or do not configure this setting definition update sources will be contacted in a default order.

This policy setting allows you to configure definition updates on startup when there is no antimalware engine present. If you enable or do not configure this setting definition updates will be initiated on startup when there is no antimalware engine present. If you disable this setting definition updates will not be initiated on startup when there is no antimalware engine present.

This policy setting allows you to configure definition updates when the computer is running on battery power. If you enable or do not configure this setting definition updates will occur as usual regardless of power state. If you disable this setting definition updates will be turned off while the computer is running on battery power.