“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...

Custom Engine Agents in Microsoft 365 Copilot

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Agents in BizChat has been available for some time already, but now there is an upcoming update to Agents. The introduction of “custom engine agents” in Microsoft 365 Copilot! These specialized agents can be built on any large language model (LLM), toolchain, or orchestration tool, tailored specifically for your domain or tenant workflows. Initially supported in Microsoft Teams, this feature will soon be available in Microsoft 365 Copilot Business Chat (BizChat).  

The introduction of Custom engine agents enables your organization to create customized experiences using your own AI systems and orchestrators. You can design unique prompts, connect to any LLM, and integrate these custom agents with Microsoft 365 Copilot. After the rollout, users will be able to access these agents, provided they are enabled and deployed in the Microsoft 365 admin center under the Copilot tab.  You can read more about the feature on this page.

Eligible users can create agents using Microsoft Copilot Studio for low-code tools or the Microsoft Teams Toolkit in Visual Studio for pro-code solutions. Access to Copilot Studio requires enabling the Microsoft Power Automate free license.  

Users can deploy agents for individual tasks and share them with internal teams, but organization-wide sharing requires admin approval. 

This feature is associated with Microsoft 365 Roadmap ID 474439 and will hopefully be in preview during February. The current target for GA is a finished roll-out by end of April.