Microsoft 365 MCP server: what exists in September 2026
Microsoft ships several MCP servers, and the ones a Canadian accounting firm would want, covering SharePoint, OneDrive, Outlook and Teams, are in preview and tied to Microsoft 365 Copilot licensing. The faster route for most firms is the Microsoft 365 connector in Claude, which is generally available on every plan and reads SharePoint, OneDrive, Outlook mail and calendar, and Teams, with write access when an administrator turns it on. For a firm whose client documents sit in SharePoint or OneDrive, an agent can be reading them today.
Status, verified September 2026
Microsoft's MCP Server for Enterprise, documented June 26, 2026, is in public preview and covers Entra directory data only, read-only; it does not reach files or mail. The Agent 365 MCP servers for SharePoint and OneDrive, Outlook mail and calendar, Teams, Word and Dataverse are in preview through Copilot Studio, and end users need a full Microsoft 365 Copilot licence to use them. The GA Microsoft servers, Microsoft Learn and Azure, are for developers rather than for documents. MCP support inside Copilot Studio has been generally available since May 2025, which lets a firm connect Armada T1 or any other MCP server to a Copilot agent.
The Microsoft 365 connector for Claude is generally available on Free, Pro, Max, Team and Enterprise plans, including the mobile apps. It reads SharePoint, OneDrive, Outlook mail and calendar, and Teams through delegated Microsoft Graph permissions; sending mail, creating calendar events, creating or updating files and posting Teams messages are available only when an administrator enables write access, and the write tools do not handle attachments. ChatGPT offers separate SharePoint, OneDrive and Outlook apps.
Underneath everything is Microsoft Graph on Entra ID OAuth 2.0, with delegated and application permission models. Canada is a local region geography under Microsoft's data residency commitments for Exchange, SharePoint, OneDrive and Teams. One caveat matters for firms that care about that: when Anthropic models are used inside Microsoft 365 Copilot, Microsoft states that the processing is outside its in-country commitments. Claude has been generally available in Microsoft Foundry since June 2026.
Status verified September 2026. We re-check this page quarterly.
What an agent can do with Microsoft 365 today
Through the Claude connector, an agent can search a SharePoint document library or a OneDrive folder for a client's uploads, read the slips and receipts, read the email thread where the client explained the rental sale, and check the calendar for the review meeting. With write access enabled by the firm's administrator, it can save a reconciliation summary back to the client folder and draft the follow-up email for a preparer to send. A firm that already runs a client-per-folder convention in SharePoint has, in effect, the same document layer that Google Drive gives a Google Workspace firm, and our Jetpack Workflow and Google Drive build translates directly.
Two cautions. Text extraction from a connector is fine for a letter and not fine for a T4; for anything with box numbers on it, have the agent read the file itself. And an inbox is not an intake system: a T5 attached to an email the agent has read is still not recorded, tracked, or reconciled against what the file expected.
Where Armada T1 fits
Armada T1 is the system of record for Canadian T1 intake, with its own MCP server. SharePoint, OneDrive and Outlook hold the documents and the conversations; Armada T1 holds what they say. An agent connected to both reads each document as it arrives, records slip and receipt data as validated section records with the source stored alongside, reconciles against the file's expected list, and routes each open question as a task to the preparer or to the client. A firm on Copilot Studio can connect Armada T1 to a Copilot agent through its GA MCP support; a firm on Claude connects it the same way it connects Microsoft 365. Armada T1 does not calculate or EFILE returns; the completed file is handed off to the CRA-certified tax software your firm already runs.
How to check for changes
Watch the Agent 365 MCP server posts for the SharePoint and Outlook servers to reach general availability and to loosen the Copilot licence requirement, and the Claude connector help page for attachment support in the write tools. For the rest of the Canadian stack, see MCP servers for Canadian tax and accounting software.
This page describes third-party products as documented by their vendors in September 2026 and is not affiliated with or endorsed by Microsoft. Microsoft 365, SharePoint, OneDrive, Outlook, Teams, Copilot and Azure are trademarks of Microsoft Corporation. Claude is a trademark of Anthropic, PBC. ChatGPT is a trademark of OpenAI. Product availability changes; verify with the vendor before relying on it.
