Microsoft's AI assistant has started doing something your email client never did before: remembering things about you based on what you write and receive, then using that information in future conversations.
The feature, rolling out across Copilot in Microsoft 365, works by scanning emails, chat messages, and other content you interact with to build a running profile. That profile might include your job title, project names, communication style, or recurring topics. Copilot then draws on this profile to personalize its answers, in theory making it feel more like an assistant who already knows your work rather than a search box that starts from zero every time.
Microsoft has built in a transparency mechanism: users can ask Copilot directly what it has stored about them, and the company says any of that information can be deleted through account settings. The memory function can also be turned off entirely for users who don't want it running in the background. But the feature is active by default, meaning the profile-building starts before most users realize it's happening.
This isn't Microsoft's first attempt at persistent AI memory, and it isn't happening in isolation. OpenAI rolled out memory features for ChatGPT in 2024 that let the assistant recall past conversations and user preferences. Google has been layering similar personalization into Gemini, pulling context from Gmail and Workspace activity. The pattern across the industry is consistent: assistants are moving from stateless tools that forget everything after each session to systems that quietly accumulate a profile of the user over time.
That shift matters because it changes what's actually at stake when you use these tools inside a business email account. A search engine query disappears after you get your results. A memory-enabled assistant embedded in your inbox is a different kind of system — one that retains inferences about you, your clients, and your business across sessions, often without an obvious prompt to review or clear it.
For small business owners, the trade-off is fairly direct. A Copilot that remembers you prefer short meeting summaries or already knows which clients are high-priority can save real time, particularly for solo operators and small teams juggling multiple roles. That's the pitch, and it's not nothing — repetitive context-setting is one of the more tedious parts of using AI tools at work.
The other side of that trade-off is less visible but worth weighing. Business inboxes routinely contain client financial details, contract terms, HR matters, and vendor negotiations. A profile built from that material is now stored somewhere, subject to whatever retention and access policies Microsoft applies, and it's a new thing an IT admin or business owner needs to account for when thinking about data handling and compliance, especially in regulated industries like healthcare, legal services, or finance.
The practical step this week is simple: open Copilot and ask what it has learned about you. If you manage Microsoft 365 accounts for a team, check whether the memory feature is enabled by default across your organization's licenses, and decide deliberately rather than by default whether it should stay on. For businesses handling sensitive client data, this is worth a five-minute conversation with whoever manages your IT setup, not a settings toggle to ignore.
Watch for two things going forward: whether Microsoft expands what data sources feed the profile beyond email and chat, and whether regulators or enterprise customers push back hard enough to force an opt-in default rather than opt-out. Both OpenAI and Google have faced user pressure over memory and data retention before, and policy adjustments after launch are common in this category.
The bottom line: Copilot's new memory feature can be reviewed and disabled, but it's on unless you turn it off, and for any business handling sensitive client or financial information, checking that setting is worth doing before, not after, something ends up in a profile you didn't know existed.