emails in recover delete items list

Okay so on Outlook 2016 under Folder tab there is a Recover Deleted items icon.   I have a few users now that have items going into there on a random basis.  The items that seem to go in that list have no rhyme or reason.  Some are items that have been moved to another folder (and still in the folder) some are task items or contact items that show in there (also still listed in the task or contact sections) and some are new emails that never seemed to make it to the inbox.  Upon contacting Microsoft they said it has to be a rule.   The problem is there is not enough consistency to be a rule.   It will be only one from a sender while others are coming through fine, it may be some with a specific subject but not all of them, some are items moved between folders but not all of the items moved as part of the group.  Also, one of the users that are having the issue (really noticed because of some emails never making it into the inbox) does not have any rules in place.  

So my questions are:
1) what are the determining factors for items to be moved into there?
2) where does it return the emails/items to when you restore them?
3) is there a way to edit the settings that govern that feature?
Perrin25Asked:
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timgreen7077Exchange EngineerCommented:
1) what are the determining factors for items to be moved into there?

There must be a rule, because that location you are referring is the recovery dumpster and emails that have been deleted from the deleted items folder are sent there which gives you time to retrieve the email once its deleted from the delete items folder. Nothing goes there own its own, so there must be a rule causing this. Either there is a rule deleting select emails or the user is clearing the delete items folder which would send those emails to the dumpster.

2) where does it return the emails/items to when you restore them?

It will restore the email to whatever folder you currently have open when you opened the recovery dumpster, so if you are in the inbox that is where it will restore it, if you are in the deleted items folder then that is where it will restore it, but note it will restore it by the date of the email so if that email is a few days old, it will restore it but it may not be at the top of the list in the folder it was restored to.

3) is there a way to edit the settings that govern that feature?

You will need to edit this in exchange, by default this is set to 14 days, so these emails can be retrieved for 14 days and after that they will be permanently deleted from the exchange server. This is is the retention settings on the mailbox DBs.

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Perrin25Author Commented:
I have determined that when running rules it does place a copy into the proper folder and then seems to delete the original email from your inbox instead of actually moving the message.   It also seems to place autosaved drafts into this list also.    I will update when I have more information.
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