Issue with Inline Images in Outlook Appointments Created via C++/MAPI Plugin

Question

Hello,

We have developed an Outlook plugin using C++ and MAPI, which interacts with our own server.

The issue we are encountering is as follows:

When we create an appointment with an inline image from the server/backend side, the image displays correctly in Outlook. However, if the appointment is modified from within Outlook, the inline image is replaced with a rectangle.

Has anyone encountered a similar issue or can suggest a solution to ensure the inline image remains intact even after the appointment is modified in Outlook?

Here is a screenshot for reference:

Thank you for your assistance!