“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...

Teams native federation being rolled out

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This feature was announced earlier this year, but have taken some time to get implemented. This feature will give users a richer experience when chatting with users outside of the home tenant with federated functionality.

However, not all users are eligible for this feature. The official documentation has been updated with a description of how it is expected to work: Microsoft Docs

The short story is: Both users must be in a tenant set in "Teams Only" mode, and have these same settings themselves. You know this is the case when you can use features like @mentions, rich text and emojis in the chat.

According to the road-map, this feature should be well on the way to your tenants and land no later than "early December": 52394