diff --git a/outlookmsgfile.py b/outlookmsgfile.py
index 69e6b48..5ecc27a 100644
--- a/outlookmsgfile.py
+++ b/outlookmsgfile.py
@@ -293,7 +293,11 @@ class INTTIME(FixedLengthValueLoader):
     # 100-nanosecond intervals since January 1, 1601.
     from datetime import datetime, timedelta
     value = reduce(lambda a, b : (a<<8)+b, reversed(value)) # bytestring to integer
-    value = datetime(1601, 1, 1) + timedelta(seconds=value/10000000)
+    try:
+        value = datetime(1601, 1, 1) + timedelta(seconds=value/10000000)
+    except OverflowError:
+        value = None
+
     return value
 
 # TODO: The other fixed-length data types: