Is it possible that if I forward calendar from outlook to an additional recipient, the email could disappear from their inbox? But I've checked with the organizer, he saw my forwarded his calendar to other person.

Hi Victor,

Really appreciate your answers and support, it's very helpful and please see my answers as your asking 3 questions as following:

1. Recipient's Email Provider: Is the additional recipient using an Outlook.com/Microsoft account, or a different email service (like Gmail, Yahoo, or a corporate account)?  Answer: the additional recipient using an Outlook.com
2. Specific Location: Did the recipient confirm they never received the forwarded email at all, or could they find it in their Junk Email or Deleted Items folder?  Answer: the additional recipient received my calendar meeting that I forwarded to her.
3. Calendar Check: Most importantly, have they checked their Calendar to see if the meeting was added automatically, even if the invitation email is no longer in their inbox?  Answer: Do you mean the additional recipient have checked their calendar right?

No. 3 please advise again, I didn't get it and please let me know if you need more information.

Regards,
[Moderator note: PII removed]

Dear kanda sriwisase,

Thanks for the clarification. Your reply is very helpful that the additional recipient is using Outlook.com and did receive the calendar meeting invite. This confirms that the initial forwarding process was successful! 

This new information changes the focus of our investigation. Since the email was received, the invite may have "disappeared" because Outlook processed it automatically. 

I apologize if my third question was unclear; let me rephrase it based on this new context: Did the additional recipient accept the meeting invitation? 

In Outlook, once an invite is accepted, the system often moves the original email invitation to the Deleted Items folder while adding the meeting to the calendar. This is expected behavior. 

If the recipient accepted the meeting, please ask them to confirm if the original email is now in their Deleted Items folder. 

We look forward to your response. 

Dear Victor,

Thank you for your reply.

Could the recipient have received my meeting invite, not clicked ‘Accept,’ and still had the email disappear from their inbox?"

Is it possible to happen like that?

Regards,

Dear kanda sriwisase,

Thanks again for the critical question and for helping us investigate this. 

You asked if the email could disappear without the recipient clicking 'Accept.' This is a very insightful question, and the answer is Yes, it is possible, and it often happens due to a specific setting within Outlook.com. 

Since the recipient is using an Outlook.com account, the most common cause for a meeting invite to disappear is a setting called "Automatically process meeting requests and responses." This is Outlook's default behavior: "By default, Outlook automatically processes meeting and poll responses, so you won't see those emails in your inbox." 

When this setting is enabled, the service will automatically add the meeting to the recipient's calendar and manage the email without requiring them to click "Accept." 

Here is what happens when auto-processing occurs: 

1. The meeting is added to the calendar with a "Tentative" status. 
2. The original invitation email is automatically moved from the Inbox, usually to the Deleted Items folder. 

For more details on this Outlook setting, you can refer to the following guide: Change how Outlook processes read receipts and meeting responses. 

To confirm if this automatic processing is what occurred, please ask the recipient to perform these two precise checks: 

1. Check the Calendar for a "Tentative" Meeting: 
   • Navigate to their Outlook.com calendar. 
   • Locate the date and time of the meeting you forwarded. 
   • Look to see if the meeting appears on their calendar, often displayed with a striped or lighter-colored bar, even without them having manually accepted it. 
2. Check the Deleted Items Folder for the Invitation: 
   • In their Outlook.com mailbox, have them open the "Deleted Items" folder. 
   • Ask them to search for or scroll to find the original invitation email you sent. 

If they find the meeting marked as "Tentative" on their calendar AND find the invitation in their Deleted Items folder, this confirms the invite was processed automatically, which is the expected behavior with this setting enabled. 

Please let us know the results of these specific checks. We look forward to your response.