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If you create a ruleset file called Default Filter Rules.xml, this will be used as the default ruleset file for all custom filtering.
To implement specific filtering for public folders or particular mailboxes, you can create named ruleset files in addition to the default ruleset file. Each target location associated with a named ruleset file is processed according to the rules in its named ruleset file. All other custom filtering will use the rules in the default ruleset file.
If no custom filtering is to be applied other than those specified by named ruleset files, it is more efficent to omit the default ruleset file, Default Filter Rules.xml, and configure the IGNORENODEFAULT registry setting.
See Setting IGNORENODEFAULT registry entry.
In this way, custom filtering is only applied to target locations explicitly defined by named ruleset files.
If you want the same actions applied to all items that the archiving tasks process (that is, specific items are not selected for processing by matching attributes), you can omit ruleset files altogether and define a default content category in the file, custom properties.xml.
Information on content categories and the custom properties.xml file is provided in the following section: