diff --git a/mailparser/utils.py b/mailparser/utils.py
index 3fd4a3c..b25fa34 100644
--- a/mailparser/utils.py
+++ b/mailparser/utils.py
@@ -230,8 +230,8 @@ def msgconvert(email):
                 command, stdin=subprocess.PIPE,
                 stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
 
-    except OSError:
-        message = "To use this function you must install 'msgconvert' tool"
+    except OSError as e:
+        message = "Check if 'msgconvert' tool is installed / {!r}".format(e)
         log.exception(message)
         raise MailParserOSError(message)