diff --git a/src/servers/gmail/main.py b/src/servers/gmail/main.py
index db1b663..1e219f6 100644
--- a/src/servers/gmail/main.py
+++ b/src/servers/gmail/main.py
@@ -591,8 +591,11 @@ async def handle_call_tool(
                 is_unread = "UNREAD" in labels
 
                 # Build email summary
+                thread_id = msg.get("threadId", "")
+
                 email_summary = (
                     f"ID: {message['id']}\n"
+                    f"Thread ID: {thread_id}\n"
                     f"From: {sender}\n"
                     f"Subject: {subject}\n"
                     f"Date: {date}\n"
diff --git a/src/servers/outlook/main.py b/src/servers/outlook/main.py
index 907c25a..5228507 100644
--- a/src/servers/outlook/main.py
+++ b/src/servers/outlook/main.py
@@ -399,7 +399,7 @@ async def handle_call_tool(
 
                 # Build request parameters
                 params = {
-                    "$select": "id,subject,from,toRecipients,ccRecipients,receivedDateTime,bodyPreview,hasAttachments",
+                    "$select": "id,subject,from,toRecipients,ccRecipients,receivedDateTime,bodyPreview,hasAttachments,conversationId",
                     "$top": count,
                     "$orderby": "receivedDateTime desc",
                 }
@@ -525,6 +525,7 @@ async def handle_call_tool(
 
                     email_info = {
                         "id": email.get("id"),
+                        "conversationId": email.get("conversationId", ""),
                         "subject": subject,
                         "from": {"name": from_name, "email": from_email},
                         "to": to_recipients,