diff --git a/connectors/src/connectors/microsoft/index.ts b/connectors/src/connectors/microsoft/index.ts
index c5bd8c18842a..414c9d279a37 100644
--- a/connectors/src/connectors/microsoft/index.ts
+++ b/connectors/src/connectors/microsoft/index.ts
@@ -6,19 +6,55 @@ import type {
   NangoConnectionId,
   Result,
 } from "@dust-tt/types";
-import { Ok } from "@dust-tt/types";
+import { Err, Ok } from "@dust-tt/types";
+import { Client } from "@microsoft/microsoft-graph-client";
 
 import type { ConnectorPermissionRetriever } from "@connectors/connectors/interface";
+import { microsoftConfig } from "@connectors/connectors/microsoft/lib/config";
+import {
+  getSites,
+  getTeams,
+} from "@connectors/connectors/microsoft/lib/graph_api";
 import { launchMicrosoftFullSyncWorkflow } from "@connectors/connectors/microsoft/temporal/client";
+import { getAccessTokenFromNango } from "@connectors/lib/nango_helpers";
 import { syncSucceeded } from "@connectors/lib/sync_status";
+import logger from "@connectors/logger/logger";
 import { ConnectorResource } from "@connectors/resources/connector_resource";
 import type { DataSourceConfig } from "@connectors/types/data_source_config";
 
+async function getClient(connectionId: NangoConnectionId) {
+  const nangoConnectionId = connectionId;
+
+  const msAccessToken = await getAccessTokenFromNango({
+    connectionId: nangoConnectionId,
+    integrationId: microsoftConfig.getRequiredNangoMicrosoftConnectorId(),
+    useCache: false,
+  });
+
+  return Client.init({
+    authProvider: (done) => done(null, msAccessToken),
+  });
+}
+
 export async function createMicrosoftConnector(
   dataSourceConfig: DataSourceConfig,
   connectionId: NangoConnectionId
-): Promise<Result<string, Error>> {
-  console.log("createMicrosoftConnector", dataSourceConfig, connectionId);
+) {
+  const client = await getClient(connectionId);
+
+  try {
+    // Sanity checks - check connectivity and permissions. User should be able to access the sites and teams list.
+    await getSites(client);
+    await getTeams(client);
+  } catch (err) {
+    logger.error(
+      {
+        err,
+      },
+      "Error creating Microsoft connector"
+    );
+    return new Err(new Error("Error creating Microsoft connector"));
+  }
 
   const connector = await ConnectorResource.makeNew(
     "microsoft",
diff --git a/connectors/src/connectors/microsoft/lib/config.ts b/connectors/src/connectors/microsoft/lib/config.ts
new file mode 100644
index 000000000000..44dbda380659
--- /dev/null
+++ b/connectors/src/connectors/microsoft/lib/config.ts
@@ -0,0 +1,7 @@
+import { EnvironmentConfig } from "@dust-tt/types";
+
+export const microsoftConfig = {
+  getRequiredNangoMicrosoftConnectorId: (): string => {
+    return EnvironmentConfig.getEnvVariable("NANGO_MICROSOFT_CONNECTOR_ID");
+  },
+};
diff --git a/connectors/src/connectors/microsoft/lib/graph_api.ts b/connectors/src/connectors/microsoft/lib/graph_api.ts
new file mode 100644
index 000000000000..6c449893e3e5
--- /dev/null
+++ b/connectors/src/connectors/microsoft/lib/graph_api.ts
@@ -0,0 +1,73 @@
+import type { Client } from "@microsoft/microsoft-graph-client";
+import type * as MicrosoftGraph from "@microsoft/microsoft-graph-types";
+
+export async function getSites(client: Client): Promise<MicrosoftGraph.Site[]> {
+  const res = await client
+    .api("/sites?search=*")
+    .select("id,name,displayName")
+    .get();
+  return res.value;
+}
+
+export async function getDrives(
+  client: Client,
+  siteId: string
+): Promise<MicrosoftGraph.Drive[]> {
+  const res = await client
+    .api(`/sites/${siteId}/drives`)
+    .select("id,name")
+    .get();
+  return res.value;
+}
+
+export async function getFilesAndFolders(
+  client: Client,
+  driveId: string,
+  parentId?: string
+): Promise<MicrosoftGraph.DriveItem[]> {
+  const parent = parentId ? `items/${parentId}` : "root";
+  const res = await client
+    .api(`/drives/${driveId}/${parent}/children`)
+    .select("id,displayName")
+    .get();
+  return res.value;
+}
+
+export async function getFolders(
+  client: Client,
+  driveId: string,
+  parentId?: string
+): Promise<MicrosoftGraph.DriveItem[]> {
+  const res = await getFilesAndFolders(client, driveId, parentId);
+  return res.filter((item) => item.folder);
+}
+
+export async function getTeams(client: Client): Promise<MicrosoftGraph.Team[]> {
+  const res = await client
+    .api("/me/joinedTeams")
+    .select("id,displayName")
+    .get();
+  return res.value;
+}
+
+export async function getChannels(
+  client: Client,
+  teamId: string
+): Promise<MicrosoftGraph.Channel[]> {
+  const res = await client
+    .api(`/teams/${teamId}/channels`)
+    .select("id,displayName")
+    .get();
+  return res.value;
+}
+
+export async function getMessages(
+  client: Client,
+  teamId: string,
+  channelId: string
+): Promise<MicrosoftGraph.Message[]> {
+  const res = await client
+    .api(`/teams/${teamId}/channels/${channelId}/messages`)
+    .get();
+  return res.value;
+}