A solid and typical filing system is to file by folder of some sort,  with the location of an item|message as the organizational metadata
But we can't select folders for restore we have to forcing us to manually select each folder and sub-folder in turn select all for Extraction|Restoration.
When doing an investigation or discovery, being able to get all the relevant data with one query would be really useful, rather than days of poking at the mailbox to extract it all when we aren't in a position to allow a investigator direct access to Retain.

We need all the messages relating to ProjectX as they were filed in the ProjectX folder and its sub-folders.   Currently we can't do this directly.