Calendar invites from external source come to me as plain email but as invites to others in my organization

Hi Denise,

I checked your domain and noticed that the MX record is not pointed to Office 365. So I would like to know if you are in an Exchange Hybrid environment. To my experience, the issue could occur when Office 365 incorrectly transforms HTML messages such as calendar invites into plain-text messages when delivery them in Hybrid.

If you are not an admin, I suggest you involve into this thread for troubleshooting. Meanwhile, please also provide some more information.
1.Please test if the issue happens if other senders from Gmail or Hotmail senders send you a meeting invite.
2.If you are in a Hybrid environment, are the affected users and unaffected users in the same side?
3.If you are not in a Hybrid environment, which mail service are you using?
4.Please provide the original mail header of the two invites received by you and other users. To protect your privacy, I have sent you a private message. You can provide the requested information in it.

Thanks,
Alex

Hi Denise,

Can you share any update at your convenience? Do you need any further assistance?

Regards,

Violet

1.   This happens with no other users within my organization.   No one uses Gmail or Hotmail.  

2.  I have not been able to find out if my company has a hybrid environment, but this doesn't happen with any other people.

3.   We use Outlook for email.

I pasted the originals in my original question.

Hi Denise,

Thanks for your update. I’d like to clarify some information:

1.  To confirm whether it’s a client related issue, please close your Outlook client, let the sender send a new meeting request to you, then sign into OWA and check whether you can see the calendar information.

2. Please contact your admin and check whether you’re in a hybrid environment.

3. About mail service, do you use Exchange Online, Exchange server or 3^rd party? Please let your admin provide this.

4. To get the mail header, please double click the email, navigate to File > Info > Properties. Please send us the original message headers of the two invites received by you and other users via the private message Alex provided before.

Regards,

Violet

Hi Denise,

Feel free to post back if you need any further assistance.

Regards,

Violet

Sorry I have been traveling.

This is the one that came to me this past week

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I am trying to get the one from my coworker.   I have also opened a ticket with our service desk to answer the other questions.

Hi Denise,

Thanks for your reply. I will wait for the message header from your coworker.

Regards,

Violet

Hi Denise,

Do you need any further assistance? Can you provide the information at your convenience?

Regards,

Violet