MCP SERVERRead and send Outlook mail, move it between folders, book and answer calendar events, keep contacts, and push files in and out of OneDrive — across more than one signed-in Microsoft account, each call naming the account_id it applies to.
LABSCO SUMMARY
Nearly every tool takes account_id, so two accounts are a parameter rather than a reason to restart the server, and unified_search then spans message, event, drive and site types in one query. The writes are direct: delete_email, delete_event, delete_contact and delete_file each remove the object outright, and the repository declares no license, which matters if this is going into a company setup.
A server over Microsoft 365 mail, calendar, contacts and OneDrive, holding several signed-in accounts at once and taking account_id on almost every one of its 35 tools.
MICROSOFT_MCP_CLIENT_ID for the Microsoft application the sign-in runs against, and a Microsoft account you can authorize through the device-code flow. The repository declares no license.
One command, then sign in — claude mcp add microsoft-mcp -e MICROSOFT_MCP_CLIENT_ID=<YOUR_MICROSOFT_MCP_CLIENT_ID> -- uvx --from git+https://github.com/elyxlz/microsoft-mcp.git microsoft-mcp, then approve the OAuth sign-in
USE CASES
List the folder without bodies, open only the messages that look load-bearing, answer them, then mark or file the rest so the same message is not read twice.
Check the attendees' availability over the window you have in mind, create the event with a timezone and a location, and answer invitations that come back the other way.
Search the mailbox for the thread, open the message with attachments included, then save the one you want to a path you can work with.
See which accounts are already signed in, start device-flow sign-in for the new one, and finish it once the code has been entered in the browser — the server keeps both.
Upload the file to the OneDrive path you want it under, then search rather than browse when it is needed later, and download it back to a local path.
Counted once with only startup setup. Other versions, modes or optional credentials may expose a different list.
authenticate_accountAuthenticate a new Microsoft account using device flow authentication
Returns authentication instructions and device code for the user to complete authentication. The user must visit the URL and enter the code to authenticate their Microsoft account.
check_availabilityCheck calendar availability for scheduling
complete_authenticationComplete the authentication process after the user has entered the device code
create_contactCreate a new contact
create_email_draftCreate an email draft with file path(s) as attachments
create_eventCreate a calendar event
create_fileUpload a local file to OneDrive
delete_contactDelete a contact
delete_emailDelete an email
delete_eventDelete or cancel a calendar event
delete_fileDelete a file or folder
get_attachmentDownload email attachment to a specified file path
get_contactGet contact details
get_emailGet email details with size limits
get_eventGet full event details
get_fileDownload a file from OneDrive to local path
list_accountsList all signed-in Microsoft accounts
list_contactsList contacts
list_emailsList emails from specified folder
list_eventsList calendar events within specified date range, including recurring event instances
list_filesList files and folders in OneDrive
move_emailMove email to another folder
reply_all_emailReply to all recipients of an email
reply_to_emailReply to an email (sender only)
respond_eventRespond to event invitation (accept, decline, tentativelyAccept)
search_contactsSearch contacts. Uses traditional search since unified_search doesn't support contacts.
search_emailsSearch emails using the modern search API.
search_eventsSearch calendar events using the modern search API.
search_filesSearch for files in OneDrive using the modern search API.
send_emailSend an email immediately with file path(s) as attachments
unified_searchSearch across multiple Microsoft 365 resources using the modern search API
entity_types can include: 'message', 'event', 'drive', 'driveItem', 'list', 'listItem', 'site' If not specified, searches across all available types.
update_contactUpdate contact information
update_emailUpdate email properties (isRead, categories, flag, etc.)
update_eventUpdate event properties
update_fileUpdate OneDrive file content from a local file
BEFORE YOU INSTALL
35 tools when we connected. Nearly every tool takes account_id first, so list_accounts, which returns the IDs, is the first call of a session. The set includes send_email plus deletes for email, events, contacts and files, limited only by the delegated permissions on your Azure app.
CONTEXT COST
Rated by the size of the 35 tool definitions that ride along on every turn, not by how many there are
INSTALLATION
claude mcp add microsoft-mcp -e MICROSOFT_MCP_CLIENT_ID=<YOUR_MICROSOFT_MCP_CLIENT_ID> -- uvx --from git+https://github.com/elyxlz/microsoft-mcp.git microsoft-mcp{
"mcpServers": {
"microsoft": {
"command": "uvx",
"args": [
"--from",
"git+https://github.com/elyxlz/microsoft-mcp.git",
"microsoft-mcp"
],
"env": {
"MICROSOFT_MCP_CLIENT_ID": "<YOUR_MICROSOFT_MCP_CLIENT_ID>"
}
}
}
}<YOUR_MICROSOFT_MCP_CLIENT_ID> is the Application ID of an Azure app you register yourself. Azure Portal → Microsoft Entra ID → App registrations → New registration (Personal + Work/School accounts), Authentication → Allow public client flows: Yes, API permissions → add the delegated Mail.ReadWrite, Calendars.ReadWrite, Files.ReadWrite, Contacts.Read, People.Read and User.Read, then copy the Application ID. On first use, the authenticate_account tool gives you a device code to sign your Microsoft account in with.
git clone https://github.com/elyxlz/microsoft-mcp.git
cd microsoft-mcp
uv syncAdd this block to your Claude Desktop configuration:
{
"mcpServers": {
"microsoft": {
"command": "uv",
"args": [
"--directory",
"<YOUR_PATH_TO_MICROSOFT_MCP>",
"run",
"microsoft-mcp"
],
"env": {
"MICROSOFT_MCP_CLIENT_ID": "<YOUR_MICROSOFT_MCP_CLIENT_ID>"
}
}
}
}<YOUR_PATH_TO_MICROSOFT_MCP> is the full path to your clone.
<YOUR_MICROSOFT_MCP_CLIENT_ID> is the Application ID of an Azure app you register yourself. Azure Portal → Microsoft Entra ID → App registrations → New registration (Personal + Work/School accounts), Authentication → Allow public client flows: Yes, API permissions → add the delegated Mail.ReadWrite, Calendars.ReadWrite, Files.ReadWrite, Contacts.Read, People.Read and User.Read, then copy the Application ID. On first use, the authenticate_account tool gives you a device code to sign your Microsoft account in with.
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