diff --git a/main.ts b/main.ts
index f225d16..f122c62 100644
--- a/main.ts
+++ b/main.ts
@@ -1,9 +1,24 @@
 import { McpServer } from "@modelcontextprotocol/server";
 import { serveStdio } from "@modelcontextprotocol/server/stdio";
+import { NodeStreamableHTTPServerTransport } from "@modelcontextprotocol/node";
+import { Command } from "commander";
+import http from "node:http";
+import crypto from "node:crypto";
 import { registerAuthTools } from "./tools/auth.ts";
 import { registerEmailTools } from "./tools/email.ts";
 import { registerFolderTools } from "./tools/folders.ts";
 
+const program = new Command()
+  .name("exchange-mcp")
+  .description("Exchange MCP Server — EWS integration via MCP")
+  .option("--transport <type>", "Transport: stdio or sse", "stdio")
+  .option("--token-hash <hash>", "SHA-256 hash of bearer token for HTTP transport auth")
+  .option("--host <host>", "HTTP host", "127.0.0.1")
+  .option("--port <port>", "HTTP port", "8000");
+
+program.parse(process.argv);
+const options = program.opts();
+
 function buildServer(): McpServer {
   const server = new McpServer({
     name: "exchange-mcp",
@@ -17,4 +32,62 @@ function buildServer(): McpServer {
   return server;
 }
 
-serveStdio(buildServer);
\ No newline at end of file
+async function main() {
+  const transportType: string = options.transport;
+
+  if (transportType === "stdio") {
+    serveStdio(buildServer);
+    return;
+  }
+
+  if (transportType === "sse") {
+    const server = buildServer();
+
+    const mcpTransport = new NodeStreamableHTTPServerTransport({
+      sessionIdGenerator: () => crypto.randomUUID(),
+    });
+
+    await server.connect(mcpTransport);
+
+    const httpServer = http.createServer(async (req, res) => {
+      if (options.tokenHash) {
+        const auth = req.headers.authorization || "";
+        const token = auth.startsWith("Bearer ") ? auth.slice(7) : "";
+        const hash = crypto.createHash("sha256").update(token).digest("hex");
+        if (hash !== options.tokenHash) {
+          res.writeHead(401, { "Content-Type": "text/plain" });
+          res.end("Unauthorized");
+          return;
+        }
+      }
+
+      res.setHeader("Access-Control-Allow-Origin", "*");
+      res.setHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS");
+      res.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization");
+
+      if (req.method === "OPTIONS") {
+        res.writeHead(200);
+        res.end();
+        return;
+      }
+
+      await mcpTransport.handleRequest(req, res);
+    });
+
+    const port = Number(options.port);
+    httpServer.listen(port, options.host);
+
+    console.error(
+      `Exchange MCP Server running via SSE on http://${options.host}:${port}`,
+    );
+    return;
+  }
+
+  console.error(`Unsupported transport: ${transportType}. Use "stdio" or "sse".`);
+  process.exit(1);
+}
+
+main().catch((error) => {
+  console.error("Fatal error:", error);
+  process.exit(1);
+});
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 742b892..a0dd93b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,7 +8,9 @@
       "name": "exchange-mcp",
       "version": "0.0.0",
       "dependencies": {
+        "@modelcontextprotocol/node": "^2.0.0-beta.2",
         "@modelcontextprotocol/server": "^2.0.0-beta.2",
+        "commander": "^15.0.0",
         "fast-xml-parser": "^5.2.0",
         "httpntlm": "^1.8.13",
         "zod": "^4.4.3"
@@ -461,6 +463,39 @@
         "node": ">=18"
       }
     },
+    "node_modules/@hono/node-server": {
+      "version": "1.19.14",
+      "resolved": "https://registry.npmjs.org/@hono/node-server/-/node-server-1.19.14.tgz",
+      "integrity": "sha512-GwtvgtXxnWsucXvbQXkRgqksiH2Qed37H9xHZocE5sA3N8O8O8/8FA3uclQXxXVzc9XBZuEOMK7+r02FmSpHtw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18.14.1"
+      },
+      "peerDependencies": {
+        "hono": "^4"
+      }
+    },
+    "node_modules/@modelcontextprotocol/node": {
+      "version": "2.0.0-beta.2",
+      "resolved": "https://registry.npmjs.org/@modelcontextprotocol/node/-/node-2.0.0-beta.2.tgz",
+      "integrity": "sha512-1ZV1t98ZpwsoiSpIxKOxZCB2qMhDkh4XMQIWhQVDsCG2pVyhSqduxsFiwMd1R0333+KzJ+ELY3RIR+iEvM9A+g==",
+      "license": "MIT",
+      "dependencies": {
+        "@hono/node-server": "^1.19.9"
+      },
+      "engines": {
+        "node": ">=20"
+      },
+      "peerDependencies": {
+        "@modelcontextprotocol/server": "^2.0.0-beta.2",
+        "hono": "^4.11.4"
+      },
+      "peerDependenciesMeta": {
+        "hono": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@modelcontextprotocol/server": {
       "version": "2.0.0-beta.2",
       "resolved": "https://registry.npmjs.org/@modelcontextprotocol/server/-/server-2.0.0-beta.2.tgz",
@@ -507,6 +542,15 @@
       ],
       "license": "MIT"
     },
+    "node_modules/commander": {
+      "version": "15.0.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-15.0.0.tgz",
+      "integrity": "sha512-z67u4ZhzCL/Tydu1lJARtEZYWbWaN7oYLHbsuzocr6y4N6WZAagG3RQ4FW61V1/0+jImpj293XfrcYnd1qxtPg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=22.12.0"
+      }
+    },
     "node_modules/des.js": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/des.js/-/des.js-1.1.0.tgz",
@@ -613,6 +657,16 @@
         "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
       }
     },
+    "node_modules/hono": {
+      "version": "4.12.28",
+      "resolved": "https://registry.npmjs.org/hono/-/hono-4.12.28.tgz",
+      "integrity": "sha512-YwUvVpSF7m1yOblFPrU3Hbo8XhPheBoiyfGuII6z19LnOr6JpDnyyp7LFNrfV56wS8tpvtBFGRISHN02pDdLOA==",
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=16.9.0"
+      }
+    },
     "node_modules/httpntlm": {
       "version": "1.8.13",
       "resolved": "https://registry.npmjs.org/httpntlm/-/httpntlm-1.8.13.tgz",
diff --git a/package.json b/package.json
index a39c2e4..c2baf3b 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,9 @@
     "format": "dprint fmt"
   },
   "dependencies": {
+    "@modelcontextprotocol/node": "^2.0.0-beta.2",
     "@modelcontextprotocol/server": "^2.0.0-beta.2",
+    "commander": "^15.0.0",
     "fast-xml-parser": "^5.2.0",
     "httpntlm": "^1.8.13",
     "zod": "^4.4.3"