There are two situations where items might remain on disk:
1. If an item cannot be ingested into the target environment, that item will remain on disk on the Staging Area.
2. If a Container Mapping is deleted from Migration Manager for Email Archives, the items which currently exist on the Staging Area will not be cleaned up, unless they are manually removed.
You will need to know Container Mapping ID and you can search for it on the Existing Mappings page or the Stage 1 page. The Container Mapping ID column might need to be added to the Stage 1 page.
Then you can search on disk (Staging area) for the appropriate items based on the Container Mapping ID. Folders will be named according to their mapping ID.
Here's an example of how to easily find a user's failed items on the staging area. The network path of the failed item should be logged in the error message on Failed Item screen:
The folder structure is slightly different in later versions of MMEA: