Deleting an item in a shared mailbox should move the item to the shared mailbox's deleted items
Today you have to use the regkey DelegateWastebasketStyle to control the behaviour when deleting items in a shard mailbox.
This should have a PowerShell command, just like for sent items (set-mailbox shared@contoso.com -MessageCopyForSentAsEnabled $True)
One of the companys i manage Office365 for has, no AD which means no GPO's to use with regkeys, no consistensy in Office versions and thus this gets unmanageble.
Please add a way for me to control this centrally in Exchange Online.

9 comments
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Adam Lavery commented
This should be default behaviour - how it works now is completely illogical to most people. Same for sent items. When Send As, it should go in the shared mailbox only; when Send on Behalf it should go in both. That is logical default behaviour which 99.999% of people expect. The overrides should be for those who want to do it illogically.
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Anonymous commented
Setting this through the O365 Admin-interface would be really nice.
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Turnschuhadmin commented
Makes me really sad that this can't even be done via powershell for shared mailboxes on 365. It's nearly impossible to explain that to a customer that the mail he is deleting inside that mailbox is not under the "mailbox\deleted items" folder. Same goes for the default behavior of sent mails, it's just counter intuitive. I know the sent items behavior can be configured now (still a bad default to me), but the deleted items are still not configurable.
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Anonymous commented
Has Someone found an solution for this on the Server side instead of the reg key on user side.
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Anonymous commented
We do use auto mapping for a large user base. Adding the shared mailbox to outlook as a separate account would be much trouble.
Currently we do use registry keys to copy sent items and deleted items to the shared mailbox appropriate folder.
This leads to different behavior if you use outkook or OWA.
The user experience should be similar on both! Plus our workplace team (dealing with workstations) would love to send everyone to OWA.
The setting already exists for sent items (i.e. on behalf), i think the short answer is that it should exist for deleted items.And then we can be more relaxed on outlook installations and communication to users saying that OWA is not Outlook. These two things represents less work for the whole organisation.
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Anonymous commented
to thomas,
No that is a really bad idea, first of that would cost more because it will require atleast a exchage online license for eatch mailbox and MessageCopyForSentAsEnabled exist already and works perfect,
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Anonymous commented
Setting DelegateWastebasketStyle through a server setting instead of local registry entry would be good. This way one would know when an email has been sent from a SharedMailbox's mailbox.
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Anonymous commented
Yes, figured this would be done already! Sorry to hear that its still pending. The comment above me won't work because a shared mailbox needs to be attached to a licensed mailbox, by design. So we still need a powershell workaround to keep items that are sent from or deleted from a shared mailbox, with that shared mailbox.
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Thomas commented
Add the shared Mailbox as an additional account via the Outlook backplane and remove it from the Default Mail Profile. That way all sent items and deleted itmes are saved in the corresponding folders of the shared Mailbox. Even rules can now be configured for the shared Mailbox. No further configuration is necessary. The parameter "MessageCopyForSentAsEnabed" is total BS and makes no sense at all.