As a Microsoft Premier Field Engineer (PFE), I assist companies with Lotus Notes and GroupWise migrations to Exchange/Outlook environments and have found that different applications act differently...
Published Apr 05, 2013
Version 1.0
Blog Post
As I've seen - and we often used that - if you configure every mailbox in Outlook (2010 or newer) as Exchange mailbox (not open the mailbox as an additional mailbox!), then the Sent Items will be stored in the "correct" corresponding Sent Items folder - and also the Deleted Items will be stored in the "correct" corresponding Deleted Items folder (Outlook in Online Mode). Could you maybe check this in another environment (maybe it's special in our setup...)?