diff --git a/ProcessMaker/Mail/MicrosoftGraphMessageConverter.php b/ProcessMaker/Mail/MicrosoftGraphMessageConverter.php
new file mode 100644
index 0000000000..e95a3ea281
--- /dev/null
+++ b/ProcessMaker/Mail/MicrosoftGraphMessageConverter.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace ProcessMaker\Mail;
+
+use Symfony\Component\Mime\Address;
+use Symfony\Component\Mime\Email;
+
+class MicrosoftGraphMessageConverter
+{
+    public static function toSendMailPayload(Email $email): array
+    {
+        $htmlBody = $email->getHtmlBody();
+        $textBody = $email->getTextBody();
+
+        $message = [
+            'subject' => $email->getSubject() ?? '',
+            'body' => [
+                'contentType' => $htmlBody !== null ? 'HTML' : 'Text',
+                'content' => $htmlBody ?? $textBody ?? '',
+            ],
+            'toRecipients' => self::convertAddresses($email->getTo()),
+        ];
+
+        $ccRecipients = self::convertAddresses($email->getCc());
+        if ($ccRecipients) {
+            $message['ccRecipients'] = $ccRecipients;
+        }
+
+        $bccRecipients = self::convertAddresses($email->getBcc());
+        if ($bccRecipients) {
+            $message['bccRecipients'] = $bccRecipients;
+        }
+
+        return [
+            'message' => $message,
+            'saveToSentItems' => true,
+        ];
+    }
+
+    /**
+     * @param  Address[]  $addresses
+     */
+    private static function convertAddresses(array $addresses): array
+    {
+        return array_map(function (Address $address) {
+            $emailAddress = ['address' => $address->getAddress()];
+
+            if ($address->getName()) {
+                $emailAddress['name'] = $address->getName();
+            }
+
+            return ['emailAddress' => $emailAddress];
+        }, $addresses);
+    }
+}
diff --git a/ProcessMaker/Mail/MicrosoftGraphTokenProvider.php b/ProcessMaker/Mail/MicrosoftGraphTokenProvider.php
new file mode 100644
index 0000000000..1b97e5af05
--- /dev/null
+++ b/ProcessMaker/Mail/MicrosoftGraphTokenProvider.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace ProcessMaker\Mail;
+
+use GuzzleHttp\Client;
+use Illuminate\Support\Facades\Cache;
+use RuntimeException;
+
+class MicrosoftGraphTokenProvider
+{
+    private const TOKEN_URL = 'https://login.microsoftonline.com/%s/oauth2/v2.0/token';
+
+    private const DEFAULT_SCOPE = 'https://graph.microsoft.com/.default';
+
+    public function __construct(
+        private array $config,
+        private int|string $serverIndex = 0,
+        private ?Client $httpClient = null
+    ) {
+    }
+
+    public function getAccessToken(): string
+    {
+        $cacheKey = 'microsoft_graph_access_token_' . ($this->serverIndex ?: 'default');
+
+        return Cache::remember($cacheKey, now()->addMinutes(50), function () {
+            return $this->requestAccessToken();
+        });
+    }
+
+    private function requestAccessToken(): string
+    {
+        $tenantId = $this->config['tenant_id'] ?? null;
+        $clientId = $this->config['key'] ?? null;
+        $clientSecret = $this->config['secret'] ?? null;
+
+        if (!$tenantId || !$clientId || !$clientSecret) {
+            throw new RuntimeException('Microsoft Graph credentials are not configured.');
+        }
+
+        $client = $this->httpClient ?? new Client();
+        $response = $client->post(sprintf(self::TOKEN_URL, $tenantId), [
+            'form_params' => [
+                'client_id' => $clientId,
+                'client_secret' => $clientSecret,
+                'scope' => self::DEFAULT_SCOPE,
+                'grant_type' => 'client_credentials',
+            ],
+            'http_errors' => false,
+        ]);
+
+        $body = json_decode($response->getBody()->getContents(), true);
+
+        if ($response->getStatusCode() >= 400) {
+            $message = $body['error_description'] ?? $body['error']['message'] ?? 'Unknown error';
+
+            throw new RuntimeException('Failed to get Microsoft Graph access token: ' . $message);
+        }
+
+        return $body['access_token'];
+    }
+}
diff --git a/ProcessMaker/Mail/Transports/MicrosoftGraphTransport.php b/ProcessMaker/Mail/Transports/MicrosoftGraphTransport.php
new file mode 100644
index 0000000000..59ff0d1b96
--- /dev/null
+++ b/ProcessMaker/Mail/Transports/MicrosoftGraphTransport.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace ProcessMaker\Mail\Transports;
+
+use GuzzleHttp\Client;
+use ProcessMaker\Mail\MicrosoftGraphMessageConverter;
+use ProcessMaker\Mail\MicrosoftGraphTokenProvider;
+use Symfony\Component\Mailer\Exception\TransportException;
+use Symfony\Component\Mailer\SentMessage;
+use Symfony\Component\Mailer\Transport\AbstractTransport;
+use Symfony\Component\Mime\MessageConverter;
+
+class MicrosoftGraphTransport extends AbstractTransport
+{
+    public function __construct(
+        private MicrosoftGraphTokenProvider $tokenProvider,
+        private string $senderEmail,
+        private ?Client $client = null
+    ) {
+        parent::__construct();
+
+        $this->client = $client ?? new Client([
+            'base_uri' => 'https://graph.microsoft.com/v1.0/',
+        ]);
+    }
+
+    protected function doSend(SentMessage $message): void
+    {
+        $email = MessageConverter::toEmail($message->getOriginalMessage());
+        $payload = MicrosoftGraphMessageConverter::toSendMailPayload($email);
+        $token = $this->tokenProvider->getAccessToken();
+
+        $response = $this->client->post('users/' . rawurlencode($this->senderEmail) . '/sendMail', [
+            'headers' => [
+                'Authorization' => 'Bearer ' . $token,
+                'Content-Type' => 'application/json',
+            ],
+            'json' => $payload,
+            'http_errors' => false,
+        ]);
+
+        if ($response->getStatusCode() >= 400) {
+            throw new TransportException(
+                'Microsoft Graph send failed: ' . $response->getBody()->getContents()
+            );
+        }
+    }
+
+    public function __toString(): string
+    {
+        return 'microsoft-graph';
+    }
+}
diff --git a/ProcessMaker/Managers/OauthMailManager.php b/ProcessMaker/Managers/OauthMailManager.php
index 603b174970..58a7d08b12 100644
--- a/ProcessMaker/Managers/OauthMailManager.php
+++ b/ProcessMaker/Managers/OauthMailManager.php
@@ -7,6 +7,8 @@
 use Google\Client as GoogleClient;
 use GuzzleHttp\Client;
 use Illuminate\Mail\MailManager;
+use ProcessMaker\Mail\MicrosoftGraphTokenProvider;
+use ProcessMaker\Mail\Transports\MicrosoftGraphTransport;
 use ProcessMaker\Models\EnvironmentVariable;
 use ProcessMaker\Models\Setting;
 use ProcessMaker\Packages\Connectors\Email\EmailConfig;
@@ -77,6 +79,26 @@ protected function createSmtpTransport($config)
         return $transport;
     }
 
+    public function createTransport(array $config)
+    {
+        if ($this->app->config->get('mail.driver') === 'microsoft_graph') {
+            return $this->createMicrosoftGraphTransport($config);
+        }
+
+        return parent::createTransport($config);
+    }
+
+    protected function createMicrosoftGraphTransport(array $config)
+    {
+        return new MicrosoftGraphTransport(
+            new MicrosoftGraphTokenProvider(
+                $this->app->config->get('services.microsoft_graph', []),
+                $this->emailServerIndex ?? 0
+            ),
+            $this->fromAddress
+        );
+    }
+
     public function checkForExpiredAccessToken()
     {
         switch ($this->authMethod) {
diff --git a/config/mail.php b/config/mail.php
index d78ea38d62..1b524c46c7 100644
--- a/config/mail.php
+++ b/config/mail.php
@@ -86,6 +86,10 @@
             'transport' => 'array',
         ],
 
+        'microsoft_graph' => [
+            'transport' => 'microsoft_graph',
+        ],
+
         'failover' => [
             'transport' => 'failover',
             'mailers' => [
diff --git a/resources/js/admin/settings/components/SettingsListing.vue b/resources/js/admin/settings/components/SettingsListing.vue
index ecba515d51..0d489764b3 100644
--- a/resources/js/admin/settings/components/SettingsListing.vue
+++ b/resources/js/admin/settings/components/SettingsListing.vue
@@ -607,7 +607,7 @@ export default {
     filterEmailServerButtons(groupName, groupData, btn) {
       const authMethod = groupData.find(data => data.key.includes("EMAIL_CONNECTOR_MAIL_AUTH_METHOD"));
       const selectedAuthMethod = authMethod ? authMethod.ui.options[authMethod.config] : null;
-      const showAuthAccBtn = selectedAuthMethod && selectedAuthMethod !== 'standard' ? true : false;
+      const showAuthAccBtn = selectedAuthMethod && selectedAuthMethod !== 'standard';
 
       if (groupName.includes('Email Server') && !showAuthAccBtn)  {
         // Returns all 'top' position buttons except the '+ Mail Server' and 'Authorize Account' button for email server tabs
diff --git a/tests/unit/ProcessMaker/Mail/MicrosoftGraphTokenProviderTest.php b/tests/unit/ProcessMaker/Mail/MicrosoftGraphTokenProviderTest.php
new file mode 100644
index 0000000000..a4f62d67d5
--- /dev/null
+++ b/tests/unit/ProcessMaker/Mail/MicrosoftGraphTokenProviderTest.php
@@ -0,0 +1,65 @@
+<?php
+
+namespace Tests\Unit\ProcessMaker\Mail;
+
+use GuzzleHttp\Client;
+use GuzzleHttp\Psr7\Response;
+use Illuminate\Support\Facades\Cache;
+use Mockery;
+use ProcessMaker\Mail\MicrosoftGraphTokenProvider;
+use RuntimeException;
+use Tests\TestCase;
+
+class MicrosoftGraphTokenProviderTest extends TestCase
+{
+    protected function tearDown(): void
+    {
+        Mockery::close();
+        parent::tearDown();
+    }
+
+    public function testGetAccessTokenThrowsWhenCredentialsAreMissing()
+    {
+        $provider = new MicrosoftGraphTokenProvider([
+            'tenant_id' => '',
+            'key' => 'client-id',
+            'secret' => 'client-secret',
+        ]);
+
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessage('Microsoft Graph credentials are not configured.');
+
+        $provider->getAccessToken();
+    }
+
+    public function testGetAccessTokenRequestsTokenFromMicrosoft()
+    {
+        Cache::flush();
+
+        $tokenResponse = new Response(200, [], json_encode(['access_token' => 'token-from-azure']));
+
+        $guzzle = Mockery::mock(Client::class);
+        $guzzle->shouldReceive('post')
+            ->once()
+            ->with(
+                'https://login.microsoftonline.com/tenant-id-123/oauth2/v2.0/token',
+                Mockery::on(function ($options) {
+                    return $options['form_params']['client_id'] === 'client-id-123'
+                        && $options['form_params']['client_secret'] === 'client-secret-123'
+                        && $options['form_params']['scope'] === 'https://graph.microsoft.com/.default'
+                        && $options['form_params']['grant_type'] === 'client_credentials'
+                        && $options['http_errors'] === false;
+                })
+            )
+            ->andReturn($tokenResponse);
+
+        $provider = new MicrosoftGraphTokenProvider([
+            'tenant_id' => 'tenant-id-123',
+            'key' => 'client-id-123',
+            'secret' => 'client-secret-123',
+        ], 1, $guzzle);
+
+        $this->assertSame('token-from-azure', $provider->getAccessToken());
+        $this->assertSame('token-from-azure', $provider->getAccessToken());
+    }
+}