Until now, connecting Claude, Anthropic’s AI assistant, to your Microsoft 365 environment meant it could read your emails and files, but not touch them. It could summarize your inbox, search for a document, answer your questions, and that was about it. On July 7, 2026, Anthropic changed that: the Microsoft 365 connector for Claude can now write.
In practice, the assistant can now draft and send an email, organize your messages, create a calendar appointment, and create or edit files in OneDrive and SharePoint. That’s a shift from an assistant that observes to one that acts on your behalf inside the tools you work in every day. For a small business, that’s convenient, but it also raises a real question about control. Here’s what the update actually does, and more importantly, how to keep it in check.
Quick answer: As of July 7, 2026, Claude’s Microsoft 365 connector does more than read your data: it can send emails, manage your calendar, and create files in OneDrive and SharePoint. These actions stay within each person’s Microsoft 365 permissions, and an administrator has to turn them on before anyone can use them. Teams remains read-only.
1. What Claude can now do in Microsoft 365
The update adds what Anthropic calls write tools. According to Claude’s official documentation, once these tools are turned on, the assistant can take real actions in Outlook, your calendar, and SharePoint, not just look things up.
- Email: draft a message, send an email, sort and organize your inbox, and set up an out-of-office auto-reply.
- Calendar: create, edit, and delete appointments.
- Files: create and update documents in OneDrive and SharePoint.
- Mailbox settings: adjust certain settings, such as sorting rules.
Reading and searching still work exactly as before. Two important limits are worth noting. First, Teams stays read-only: Claude can read conversations, but it can’t post a message or change a Teams setting. Second, attachments aren’t supported: the assistant can’t send or draft an email with a file attached.
2. Why this matters for a small business
The difference between reading and writing sounds technical, but it’s huge in day-to-day work. An assistant that reads saves you research time. An assistant that writes carries out tasks for you.
Think about the repetitive tasks that eat up a workday at a small company: replying to a routine follow-up email, sending out meeting notes, blocking off time on the calendar, dropping an updated document into SharePoint so the team is working from the right version. These are exactly the tasks Claude can now handle, from a simple written instruction.
- Ask Claude to draft and send a reminder email to a client based on your notes.
- Have it create an appointment and invite the right people after a call.
- Have it produce a document in SharePoint that the whole team can find in the same place.
- Automate inbox sorting with clear rules.
The time saved is real, but it doesn’t replace solid organization of your access and your data. An assistant acting inside Microsoft 365 is only as well governed as the environment it works in. This is exactly where an IT partner earns its keep: structuring permissions, groups, and files before opening the door to automation. You can see how we approach this on our managed IT services page.
3. The real issue: staying in control
An assistant that can send an email on your behalf or edit a shared document needs guardrails. The good news: Anthropic built the feature with built-in limits, and a small business can tighten things up even further.
Actions respect each person’s permissions
Claude can never go beyond the Microsoft 365 rights of the person operating it. If an employee doesn’t have access to a SharePoint site, the assistant doesn’t either when it’s working on that person’s behalf. In other words, managing your Microsoft 365 permissions remains your first line of defense.
Nothing switches on by itself
The write tools don’t roll out automatically. A Microsoft Entra administrator has to approve the new permission set, and then the organization has to turn on writing for accounts. If your company had already connected the connector in read-only mode, an administrator needs to take a deliberate action before anything changes. Until someone does, Claude stays read-only.
Think it through before opening writing to everyone
Turning on writing for the entire staff at once isn’t always the best move. Many small businesses are better off starting with a small team, checking the results, then expanding from there. It’s a governance decision, not just a checkbox.
4. How to turn on (or block) the write tools
The Microsoft 365 connector works on every Claude plan: Free, Pro, Max, Team, and Enterprise. Writing, though, requires activation by an administrator, it isn’t automatic.
Here are the main steps on the organization side:
- A Microsoft Entra administrator reviews and approves the updated permission set.
- In Claude’s organization settings, under Connectors, find Microsoft 365 and choose the access level you want.
- Decide who gets write access: everyone, or a small group to start.
If you’d rather not turn on writing yet, that’s a perfectly valid choice too. Keeping the connector read-only still gives you a search assistant without the risk of an action firing off on its own. Every company has a different comfort level, and there’s no wrong answer as long as the decision is a deliberate one. If you’d like us to review your setup with you, reach out through our contact page.
Frequently asked questions
Can Claude send an email without me seeing it first?
Claude acts on instructions and within the Microsoft 365 permissions of the person using it. Writing has to be turned on by an administrator first. A good practice is to have the assistant prepare a draft for you to review before sending, especially early on.
Does this work with Teams?
No, not for writing. Teams stays read-only: Claude can read conversations, but it can’t post a message or change a Teams setting. Writing covers email, calendar, mailbox settings, OneDrive, and SharePoint.
Do I need a paid plan to use the Microsoft 365 connector?
The connector is available on every plan, including Free. The write tools, however, require activation by an administrator, so they aren’t available by default regardless of plan.
A useful update, as long as you manage it well
An assistant that writes into your tools can save a small team real hours every week, provided your permissions, access, and rules are clean to start with. That’s where preparation matters more than the technology itself. If you want to connect Claude to your Microsoft 365 without opening doors you didn’t plan on, our team can structure your access and data first: check out our managed IT services or reach us through our contact page.