“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...

Guest Access will be default "on" for Teams

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Here is a heads up for all Teams admins:
- ".. to bring Teams Guest capability into alignment with the rest of the suite, where the setting is already on by default." Microsoft is changing this policy (Allow Guest Access) to on.

I would assume most organizations have been turning this feature on, to encourage collaboration. And there is no need to take any action if you already set this policy to allow. But if some reason you need to turn this off for the entire organization, you will need to do so manually once this setting has been deployed.

According to "Message ID: MC228482" in the admin message center, this should start rolling out on February 8th.

Read more about the configuration options here.