Hi Vienna,
Let me know if the above solution works for you.
As for us,
We were facing this error from more than a year tried everything mentioned in forum and BP portal, had calls with the BP support guys themselves as well as the Microsoft support team, but no solution was found. We fixed it at the code level and now it has been a month since we faced this.
Solution:
We had the code written in such a way that it would Open Outlook then Read Mail/Get Item and then Close it. BP suggests to fetch any mail from outlook without opening from the background.
Our understanding is that, if there is any instance open for Outlook and BP tries to communicate with it then it will fail. Any instance should not be open while the bot runs.
Let me know if this helps for you too.
Regards