Microsoft's Outlook Downloads TokenFactoryIFrame File on Every Email Service Visit

Microsoft's Outlook downloads TokenFactoryIFrame file on macOS on every visit via the Safari browser. The file is downloaded every few seconds. According to the research, the issue is caused by the server-side update released to the Outlook and it has nothing to do with Safari or macOS. Microsoft has been informed about the problem, but hasn't released the statement on its cause yet. Read more...