diff --git a/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/OutlookExtractor.java b/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/OutlookExtractor.java
index 4b2c6ae17e..641be6b896 100644
--- a/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/OutlookExtractor.java
+++ b/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/OutlookExtractor.java
@@ -575,13 +575,11 @@ private void handleGeneralDates(MAPIMessage msg, Map<String, String[]> headers,
                 }
             }
         }
-        //try to overwrite the modified property if the actual LAST_MODIFICATION_TIME property exists.
-        List<PropertyValue> timeProp = msg.getMainChunks().getProperties().get(MAPIProperty.LAST_MODIFICATION_TIME);
-        if (timeProp != null && ! timeProp.isEmpty()) {
-            Calendar cal = ((PropertyValue.TimePropertyValue)timeProp.get(0)).getValue();
-            metadata.set(TikaCoreProperties.MODIFIED, cal);
-        }
-
+        //Note: PR_LAST_MODIFICATION_TIME is intentionally not used to overwrite dcterms:modified here.
+        //For a .msg file, that MAPI property reflects when the message's underlying storage was
+        //last written (e.g. when the item was saved/exported to disk), not when its content was
+        //actually edited, and can be long after the message was sent/received. It remains available,
+        //unmodified, as mapi:last-modification-time (see handleMessageInfo/LITERAL_TIME_PROPERTIES).
     }
 
     private void handleBodyChunks(Chunk htmlChunk, Chunk rtfChunk, Chunk textChunk,
diff --git a/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/test/java/org/apache/tika/parser/microsoft/OutlookParserTest.java b/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/test/java/org/apache/tika/parser/microsoft/OutlookParserTest.java
index 9d06f7bf94..041d4d20f2 100644
--- a/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/test/java/org/apache/tika/parser/microsoft/OutlookParserTest.java
+++ b/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/test/java/org/apache/tika/parser/microsoft/OutlookParserTest.java
@@ -81,6 +81,13 @@ public void testOutlookParsing() throws Exception {
         // Stored as Thu, 5 Apr 2007 09:26:06 -0700
         assertEquals("2007-04-05T16:26:06Z", metadata.get(TikaCoreProperties.CREATED));
 
+        //TIKA-4798: dcterms:modified should reflect the message date, not
+        //PR_LAST_MODIFICATION_TIME, which for a .msg file records when the file's
+        //underlying storage was last written (e.g. resaved/exported to disk), and
+        //can be much later than when the message was actually sent/received.
+        assertEquals("2007-04-05T16:26:06Z", metadata.get(TikaCoreProperties.MODIFIED));
+        assertEquals("2007-10-05T05:37:49Z", metadata.get("mapi:last-modification-time"));
+
         String content = handler.toString();
         assertNotContained("Microsoft Outlook Express 6", content);
         assertNotContained("L'\u00C9quipe Microsoft Outlook Express", content);