Latest Windows 11 cumulative update KB5040442 has stopped MAPI from working

Question

Our software currently uses MAPI to connect to Outlook (32 bit), however we are having issues whereby when a customer updates their Windows with the KB5040442 cumulative update, MAPI fails to work. I have seen other softwares online mention the same issue. Does anybody have a workaround for this or is this something Microsoft will be updating with a new patch?

Answer 1

Hi @Adam Graziour

Thanks for the sharing. I'm glad you found a way to reconnect with MAPI.

---

However, due to a recent update in forum policy, the question author now is not able to accept their own answers.

So, I have written a brief summary of the solution this issue. Please feel free to accept it as the answer, which would benefit others who also has similar issues in forum.

[Latest Windows 11 cumulative update KB5040442 has stopped MAPI from working]

Issue: Our software currently uses MAPI to connect to Outlook (32 bit), however we are having issues whereby when a customer updates their Windows with the KB5040442 cumulative update, MAPI fails to work.

Solution: Uninstalling this KB5040442 update allows you to reconnect to MAPI.

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.