diff --git a/packages/twenty-front/src/modules/accounts/types/MessageChannel.ts b/packages/twenty-front/src/modules/accounts/types/MessageChannel.ts
index 87d775283..5695d7fd8 100644
--- a/packages/twenty-front/src/modules/accounts/types/MessageChannel.ts
+++ b/packages/twenty-front/src/modules/accounts/types/MessageChannel.ts
@@ -1,3 +1,4 @@
+import { ConnectedAccountProvider } from 'twenty-shared';
 import { MessageChannelVisibility } from '~/generated/graphql';
 
 export enum MessageChannelContactAutoCreationPolicy {
@@ -36,5 +37,9 @@ export type MessageChannel = {
   syncCursor: string;
   syncStageStartedAt: Date;
   throttleFailureCount: number;
+  connectedAccount?: {
+    id: string;
+    provider: ConnectedAccountProvider;
+  };
   __typename: 'MessageChannel';
 };
diff --git a/packages/twenty-front/src/modules/activities/emails/right-drawer/components/RightDrawerEmailThread.tsx b/packages/twenty-front/src/modules/activities/emails/right-drawer/components/RightDrawerEmailThread.tsx
index 1ac7fb651..92b3fdc7e 100644
--- a/packages/twenty-front/src/modules/activities/emails/right-drawer/components/RightDrawerEmailThread.tsx
+++ b/packages/twenty-front/src/modules/activities/emails/right-drawer/components/RightDrawerEmailThread.tsx
@@ -13,6 +13,8 @@ import { RIGHT_DRAWER_CLICK_OUTSIDE_LISTENER_ID } from '@/ui/layout/right-drawer
 import { messageThreadState } from '@/ui/layout/right-drawer/states/messageThreadState';
 import { useClickOutsideListener } from '@/ui/utilities/pointer-event/hooks/useClickOutsideListener';
 import { useIsMobile } from '@/ui/utilities/responsive/hooks/useIsMobile';
+import { assertUnreachable } from '@/workflow/utils/assertUnreachable';
+import { ConnectedAccountProvider } from 'twenty-shared';
 import { Button, IconArrowBackUp } from 'twenty-ui';
 
 const StyledWrapper = styled.div`
@@ -52,6 +54,7 @@ export const RightDrawerEmailThread = () => {
     messageThreadExternalId,
     connectedAccountHandle,
     messageChannelLoading,
+    connectedAccountProvider,
   } = useRightDrawerEmailThread();
 
   useEffect(() => {
@@ -94,17 +97,38 @@ export const RightDrawerEmailThread = () => {
 
   const canReply = useMemo(() => {
     return (
-      connectedAccountHandle && lastMessage && messageThreadExternalId != null
+      connectedAccountHandle &&
+      connectedAccountProvider &&
+      lastMessage &&
+      messageThreadExternalId != null
     );
-  }, [connectedAccountHandle, lastMessage, messageThreadExternalId]);
+  }, [
+    connectedAccountHandle,
+    connectedAccountProvider,
+    lastMessage,
+    messageThreadExternalId,
+  ]);
 
   const handleReplyClick = () => {
     if (!canReply) {
       return;
     }
 
-    const url = `https://mail.google.com/mail/?authuser=${connectedAccountHandle}#all/${messageThreadExternalId}`;
-    window.open(url, '_blank');
+    let url: string;
+    switch (connectedAccountProvider) {
+      case ConnectedAccountProvider.MICROSOFT:
+        url = `https://outlook.office365.com/mail/inbox/id/${messageThreadExternalId}`;
+        window.open(url, '_blank');
+        break;
+      case ConnectedAccountProvider.GOOGLE:
+        url = `https://mail.google.com/mail/?authuser=${connectedAccountHandle}#all/${messageThreadExternalId}`;
+        window.open(url, '_blank');
+        break;
+      case null:
+        throw new Error('Account provider not provided');
+      default:
+        assertUnreachable(connectedAccountProvider);
+    }
   };
   if (!thread || !messages.length) {
     return null;
diff --git a/packages/twenty-front/src/modules/activities/emails/right-drawer/hooks/useRightDrawerEmailThread.ts b/packages/twenty-front/src/modules/activities/emails/right-drawer/hooks/useRightDrawerEmailThread.ts
index 6bfa8f123..705dfc8f6 100644
--- a/packages/twenty-front/src/modules/activities/emails/right-drawer/hooks/useRightDrawerEmailThread.ts
+++ b/packages/twenty-front/src/modules/activities/emails/right-drawer/hooks/useRightDrawerEmailThread.ts
@@ -132,7 +132,10 @@ export const useRightDrawerEmailThread = () => {
       recordGqlFields: {
         id: true,
         handle: true,
-        connectedAccountId: true,
+        connectedAccount: {
+          id: true,
+          provider: true,
+        },
       },
       skip: !lastMessageChannelId,
     });
@@ -159,11 +162,17 @@ export const useRightDrawerEmailThread = () => {
     })
     .filter(isDefined);
 
+  const connectedAccount =
+    messageChannelData.length > 0
+      ? messageChannelData[0]?.connectedAccount
+      : null;
+  const connectedAccountProvider = connectedAccount?.provider ?? null;
   return {
     thread,
     messages: messagesWithSender,
     messageThreadExternalId,
     connectedAccountHandle,
+    connectedAccountProvider,
     threadLoading: messagesLoading,
     messageChannelLoading,
     fetchMoreMessages,