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When you add a new Exchange Public Folder task, the task runs at the scheduled times, archiving from each of its target folders.
For each folder, the Exchange Public Folder task does the following:
Matches the permissions on the folder's archive to those on the folder.
If the folder has been given explicit Enterprise Vault archiving settings, then the Exchange Public Folder task archives according to those settings. Otherwise, the Exchange Public Folder task uses the default settings that you have defined in the Exchange Public Folder Policy.
If the folder is the root path of a Public Folder target that is processed by a different Exchange Public Folder task, it does not archive the folder, nor any folders beneath it.
If the folder is not accessible, then the Exchange Public Folder task does not archive the folder, nor any folders beneath it.
As with archiving other types of files, the Storage Service converts the Public Folder items to HTML, if possible, and stores them in the archives. The Indexing Service indexes the item details and content to enable searching. Note that the archive used for a Public Folder can be changed at any time by editing its properties in the Administration Console.
Figure: Archiving Public Folder hierarchies shows a Public Folder hierarchy that is archived by Exchange Public Folder tasks A and B.
When task B finds the root path folder for task A, it archives no further down that branch of the hierarchy.
Note that archiving on root path A was created before archiving on root path B, because you cannot add a Public Folder target with a root path that is already archived by an existing Exchange Public Folder task.
