This is the new mail client for Windows 11 which MS have decided to call outlook. It is not about Outlook that comes with office.
When I first start up the mail client, everything works fine. If I then close it (click on X) and then reopen it about 20 or 30 minutes later, it opens, but I also get a pop up box saying "Outlook is already running". If doesn't happen if I close it and reopen immediately.
