diff --git a/offlineimap/repository/IMAP.py b/offlineimap/repository/IMAP.py
index 1f5c855..700d4f2 100644
--- a/offlineimap/repository/IMAP.py
+++ b/offlineimap/repository/IMAP.py
@@ -561,7 +561,8 @@ class IMAPRepository(BaseRepository):
             try:
                 self.makefolder_single(folder_path)
             except OfflineImapError as e:
-                if '[ALREADYEXISTS]' not in e.reason:
+                reasonLower = e.reason.lower()  # Handle reasons '[ALREADYEXISTS]' and 'Mailbox already exists!' @chris001
+                if not ('already' in reasonLower and 'exists' in reasonLower):
                     raise
 
     def makefolder_single(self, foldername):