Unable to save as .msg

Actually yes. Now I have the msg file saved, but am unable to open it. I get the "Error- We can’t open ‘C:\Users\UiPath\mail.msg’.It’s possible the file is already open, or you don’t have permission to open it
same error as in these threads:

The workaround seems to be saving as .eml, but as mentioned previously that is now a viable option for this process. Anybody who knows why this error occurs?