Claude can now write in your Microsoft 365: email, calendar and files

Until now, connecting Claude, Anthropic’s artificial intelligence assistant, to your Microsoft 365 let it read your email and your files but never touch them. It summarized your inbox, found a document, answered your questions, and that was the extent of it. On July 7, 2026, Anthropic changed that: the Claude connector for Microsoft 365 can now write.

In practice, the assistant can draft and send an email, sort your messages, create an appointment in your calendar, and create or edit files in OneDrive and SharePoint. It moves from an assistant that observes to one that acts on your behalf inside your work tools. For a small business, that is handy, and it raises a genuine question about control. Here is what the feature does, and more importantly how to keep it in check.

1. What can Claude now do inside Microsoft 365?

The update adds what Anthropic calls write tools. According to the official Claude documentation, once those tools are enabled the assistant can take real actions in Outlook, the calendar and SharePoint, not just look at your data.

• Email: draft a message, send it, file and sort your inbox, and set up an out-of-office reply.
• Calendar: create, edit and delete appointments.
• Files: create and update documents in OneDrive and SharePoint.
• Mailbox settings: adjust certain parameters, such as sorting rules.

Reading and searching still work as before. Two important limits are worth remembering. First, Teams stays read-only: Claude can read conversations but cannot post a message or change a Teams setting. Second, attachments are not supported: the assistant cannot send or prepare an email with a file attached.

2. Why does this matter for a small business?

The difference between reading and writing sounds technical, but it is enormous day to day. An assistant that reads saves you time looking things up. An assistant that writes carries out tasks for you.

Think of the repetitive steps that eat a day in a small company: answering a standard follow-up email, sending out meeting notes, blocking off a slot in the calendar, dropping an updated document into SharePoint so the team works on the right file. Those are the tasks Claude can now take on, from a simple written instruction.

• Ask Claude to prepare 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.
• Get it to produce a document in SharePoint that the whole team sees in one place.
• Automate inbox sorting with clear rules.

The time saved is real, but it does not replace a well-organized set of accounts and data. An assistant acting inside Microsoft 365 is only as well governed as the environment it works in. That preparation is exactly where an IT partner helps: structuring permissions, groups and files before you open the door to automation. You can see how we approach it in our Microsoft 365 services.

3. The real issue: keeping control

An assistant that can send an email in your name or edit a shared document needs guardrails. The good news is that Anthropic built the feature with limits baked in, and a small business can tighten things further.

Actions respect each person’s permissions

Claude can never exceed the Microsoft 365 rights of the user directing it. If an employee has no access to a SharePoint site, the assistant has none either while working for that person. Managing your Microsoft 365 permissions therefore remains your first line of defence.

Nothing turns itself on

The write tools do not deploy automatically. A Microsoft Entra administrator has to approve the new permission set, then the organization has to enable writing for accounts. If your company had already connected the connector in read-only mode, an administrator must take a deliberate action before anything changes. Until someone does, Claude stays in read mode.

Think before opening writing to everyone

Turning writing on for the entire staff at once is not always the best move. Many small businesses do better starting with a small team, checking the results, then widening. It is a governance decision, not just a box to tick.

4. How do you enable (or block) the write tools?

The Microsoft 365 connector works on every Claude plan: Free, Pro, Max, Team and Enterprise. Writing, however, requires an administrator to enable it. It is not automatic.

Here are the main steps on the organization side:

1. A Microsoft Entra administrator reviews and approves the updated permission set.
2. In Claude’s organization settings, under Connectors, find Microsoft 365 and choose the access level you want.
3. Decide who gets write access: everyone, or a limited group to start.

If you would rather not enable writing for now, that is a valid choice too. Leaving the connector read-only gives you the research assistant without the risk of an action going out on its own. Every company has a different comfort level, and there is no wrong answer as long as the decision is deliberate. If you want us to look at your configuration with you, write to us on our contact page.

Frequently asked questions

Can Claude send an email without me seeing it?

Claude acts on instruction and within the Microsoft 365 permissions of the person using it. Writing has to be enabled by an administrator first. A good practice is to ask the assistant to prepare a draft that you review before sending, especially at the beginning.

Does it work with Teams?

Not for writing. Teams stays read-only: Claude can read conversations but cannot post a message or change a Teams setting. Writing covers email, calendar, mailbox settings, OneDrive and SharePoint.

Do you need a paid plan to use the Microsoft 365 connector?

The connector is available on every plan, including Free. The write tools, though, require an administrator to enable them, so they are not available by default on any plan.

A useful addition, provided you frame it

An assistant that writes inside your tools can save a small team real hours every week, as long as your permissions, access and rules are clean to begin with. That is where preparation counts more than technology. If you want to connect Claude to your Microsoft 365 without opening doors you did not plan on, our team can structure your access and your data first: see our managed IT services or reach us through the contact page.