Updated Calendar Invites are getting sent to "Deleted Items"

Hi @Alex Morales, 

Welcome to Microsoft Q&A forum. 

Thank you for reaching out and sharing your concern regarding the behavior of updated calendar invitations in classic Outlook. According the concern, when you accept or decline a meeting invitation, Outlook will remove the invitation from your inbox, when you have the "Delete meeting requests and notifications from Inbox after responding" option is enabled.  

To resolve this, please follow these steps: 

1. In classic Outlook go to File > Options > Mail. 
2. Scroll down to the Send messages section. 

3. Uncheck the "Delete meeting requests and notifications from Inbox after responding" option. 
4. Click OK. 

Regarding the second behavior, it can happen if you have these calendar settings enabled in new Outlook and Outlook on the web: 

• Delete invitations that have been updated by the organizer. 
• Delete invitations from Inbox after responding. 

To disable these settings, please try these steps in new Outlook: 

1. From classic Outlook, select the Try the new Outlook toggle which is in the upper-right corner of your classic Outlook window. 

2. Go to Settings > Calendar > Events and invitations. 
3. Uncheck these settings: 
   • Delete invitations that have been updated by the organizer. 
   • Delete invitations from Inbox after responding. 

4. Once finished, click Save. 

I hope this information is helpful. Please follow the steps above and let me know if it works for you. If not, we can continue working together to resolve the issue.  

Thank you for your patience and understanding. If you have any questions or need additional assistance, please don’t hesitate to reach out so I can continue to support you. If you found the response useful, please consider marking it as accepted, as this may help other community members who are looking for similar guidance.  

I look forward to continuing the conversation.

If you have extra questions about this answer, please click "Comment". 

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In classic Outlook and Outlook on the web, meeting-related messages (original invites, updates, and responses) can be auto-removed from the Inbox when they are no longer current. That is why updates and some notifications appear directly in Deleted Items instead of staying in the Inbox.

To keep these messages in the Inbox instead of having them moved/deleted automatically, adjust the automatic processing settings:

1. In Outlook on the web:
   1. Select the Settings gear icon.
   2. Choose View all Outlook settings.
   3. Go to Calendar > Events and invitations.
   4. Under Invitations, clear or turn off options that automatically delete or remove meeting messages, especially:
      • Delete invitations and responses that have been updated
   5. Save the changes.

With Delete invitations and responses that have been updated disabled, updated meeting requests and related notifications will remain in the Inbox instead of being moved to Deleted Items when a new version arrives.

If the user is in classic Outlook for Windows but backed by Exchange Online, these server-side settings (configured in Outlook on the web) control the behavior for that mailbox.

References:

• Calendar settings in Outlook on the web