diff --git a/weboob/applications/boobmsg/boobmsg.py b/weboob/applications/boobmsg/boobmsg.py
index bf66b4b0..6bd68b3a 100644
--- a/weboob/applications/boobmsg/boobmsg.py
+++ b/weboob/applications/boobmsg/boobmsg.py
@@ -27,6 +27,7 @@ from tempfile import NamedTemporaryFile
 from lxml import etree
 
 from weboob.core import CallErrors
+from weboob.capabilities.base import empty
 from weboob.capabilities.messages import CapMessages, Message, Thread
 from weboob.capabilities.account import CapAccount
 from weboob.capabilities.contact import CapContact
@@ -281,8 +282,8 @@ class Boobmsg(ReplApplication):
 
         results = {}
         for field in self.do('get_account_status',
-                                      backends=backend_name,
-                                      caps=CapAccount):
+                             backends=backend_name,
+                             caps=CapAccount):
             if field.backend in results:
                 results[field.backend].append(field)
             else:
@@ -419,7 +420,7 @@ class Boobmsg(ReplApplication):
         cmd = self.do('get_thread', _id, backends=backend_name)
         self.start_format()
         for thread in cmd:
-            if thread is not None :
+            if thread is not None:
                 for msg in thread.iter_all_messages():
                     self.format(msg)
 
@@ -437,11 +438,22 @@ class Boobmsg(ReplApplication):
         try:
             message = self.messages[int(arg) - 1]
         except (IndexError, ValueError):
-            id, backend_name = self.parse_id(arg)
-            cmd = self.do('get_thread', id, backends=backend_name)
-            for thread in cmd:
-                if thread is not None:
+            # The message is not is the cache, we have now two cases:
+            # 1) the user uses a number to get a thread in the cache
+            # 2) the user gives a thread id
+            try:
+                thread = self.threads[int(arg) - 1]
+                if not empty(thread.root):
                     message = thread.root
+                else:
+                    for thread in self.do('get_thread', thread.id, backends=thread.backend):
+                        if thread is not None:
+                            message = thread.root
+            except (IndexError, ValueError):
+                _id, backend_name = self.parse_id(arg)
+                for thread in self.do('get_thread', _id, backends=backend_name):
+                    if thread is not None:
+                        message = thread.root
         if message is not None:
             self.start_format()
             self.format(message)