“Bring your AI to work” is here: Microsoft edition - What Multiple Account Access to Copilot means

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Multiple Account Access to Copilot On October 1. 2025 Microsoft released a blog post explaining how employees now can use Copilot from their personal 365 plans to work on organizational data. This is of course, an extension of the already existing "Multi account" feature that was released for corporate accounts a "couple of months" ago. In other words, “bring your own Copilot” is now a real thing in Word, Excel, PowerPoint, Outlook, and OneNote on desktop and mobile, with enterprise protections intact. “Bring your AI to work” is an important topic, and banning AI altogether might not be the answer. Whether sanctioned or shadow, AI has already entered everyday knowledge work. Microsoft’s new multi‑account access offers a safer path where employees can use Copilot from their personal Microsoft 365 subscriptions on work files, while the file’s access, auditing, and compliance still flow through the work identity and tenant. That’s better than users copy‑pasting sensit...

Microsoft Authenticator lite generally available

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Microsoft Authenticator Lite has been made generally available (post). This is a feature allowing Microsoft Outlook to work as the authenticator app for a user. This is a nice feature for users who are not using MFA, or maybe still use SMS MFA for their login and don't want to install the authenticator app for some reason.

I would of course, recommend to use the authenticator app itself, but admit this can simplify things for users. The feature isn't "brand new", but it has not been supported for the legacy "per user mfa" a lot of organizations are still using. 

If you do not want this new feature available to users, you would have to turn it off, as it seems it will automatically made available to everyone. There is a good description of how to do so in this article. This will be rolling out from late september and for a couple of weeks.