• Microsoft: Outlook bug downloads ‘TokenFactoryIframe’ file on every visit

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    Microsoft’s Outlook is downloading a mysterious file called “TokenFactoryIframe” on macOS when users visit the email service via the Safari browser. This issue has now been widely reported by users who have discovered the ‘TokenFactoryIframe’ file that Outlook downloaded on every visit.

    Outlook downloads this mysterious file every few seconds or at least on every visit to Outlook on Apple’s platform. According to our findings, this appears to be an issue caused by a faulty server-side update released to the Outlook and it has nothing to do with Safari or macOS.

    Microsoft acknowledged the problem in a statement, but the company hasn’t revealed what’s causing the downloads. It’s likely due to an error in the HTML of the Microsoft 365 platform..

    Microsoft spokesperson said the problem is limited to Safari and users can switch to any other browser to prevent this from happening. However, we have received reports claiming the issue can also affect Chrome and Firefox on Apple’s platforms…

    The file is harmless and empty.

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