diff --git a/CHANGELOG.md b/CHANGELOG.md
index b216972a..559a2d5d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 * Extension: item verification on commandline
 * Improvement: catch lack of support of PERIOD in vobject <= 0.9.9
 * Fix: sharing: backmap of REPORT/PROPPATCH hrefs is now URL-encode-aware (edit of a shared collection failed when the principal contains '@')
+* Workaround: remove trailing spaces on TZID and TZNAME appended by buggy Microsoft clients
 
 ## 3.7.5
 * Add: [sharing] conversion_bday_summary_template (customize summary)
diff --git a/radicale/item/__init__.py b/radicale/item/__init__.py
index 17cb66fb..7a33ce03 100644
--- a/radicale/item/__init__.py
+++ b/radicale/item/__init__.py
@@ -69,6 +69,9 @@ def read_components(s: str) -> List[vobject.base.Component]:
     s = re.sub(r'[\x00-\x08\x0B\x0C\x0E-\x1F]', '', s)
     # Workaround delete all empty lines to avoid vobject parsing errors
     s = re.sub(r'(?m)^[ \t]*\r?\n', '', s)
+    # Delete trailing space on TZID and TZNAME (Microsoft Outlook bug)
+    s = re.sub(r'(TZID|TZNAME)(:[^\r\n]+) (\r?\n)', r"\1\2\3", s)  # fix VTIMEZONE
+    s = re.sub(r'(TZID=[^:]+) (:)', r"\1\2", s)  # fix DTSTART/DTEND
     return list(vobject.readComponents(s, allowQP=True))
 
 
diff --git a/radicale/tests/static/event_issue2172.ics b/radicale/tests/static/event_issue2172.ics
new file mode 100644
index 00000000..a4a9cd16
--- /dev/null
+++ b/radicale/tests/static/event_issue2172.ics
@@ -0,0 +1,44 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
+BEGIN:VTIMEZONE
+TZID:Mitteleuropäische Zeit 
+BEGIN:STANDARD
+DTSTART:20001025T020000
+RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
+TZNAME:Mitteleuropäische Zeit 
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+END:STANDARD
+BEGIN:DAYLIGHT
+DTSTART:20000329T010000
+RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
+TZNAME:Mitteleuropäische Sommerzeit 
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+END:DAYLIGHT
+END:VTIMEZONE
+BEGIN:VEVENT
+UID:20260619T141049Z_FED000F14A0
+DTSTART;TZID=Mitteleuropäische Zeit :20260701T170000
+DTEND;TZID=Mitteleuropäische Zeit :20260701T183000
+ATTENDEE;CN=Mario Voigt;CUTYPE=INDIVIDUAL;PARTSTAT=ACCEPTED:mailto:REDACTED@REDACTED
+CLASS:PUBLIC
+DESCRIPTION:REDACTED
+DTSTAMP:20260621T173336Z
+LAST-MODIFIED:20260621T173336Z
+LOCATION:Stadtwerkstatt
+ORGANIZER;CN=REDACTED;ROLE=CHAIR:mailto:REDACTED
+PRIORITY:5
+SUMMARY:REDACTED
+TRANSP:OPAQUE
+X-GWBOX-TYPE:SENT
+X-GWCLASS:NORMAL
+X-GWITEM-TYPE:APPOINTMENT
+X-GWSHOW-AS:BUSY
+X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY
+X-MOZ-INVITED-ATTENDEE:mailto:REDACTED@REDACTED
+X-MOZ-RECEIVED-DTSTAMP:20260621T173336Z
+X-MOZ-RECEIVED-SEQUENCE:0
+END:VEVENT
+END:VCALENDAR
diff --git a/radicale/tests/test_base.py b/radicale/tests/test_base.py
index 38775595..1c934f6a 100644
--- a/radicale/tests/test_base.py
+++ b/radicale/tests/test_base.py
@@ -193,6 +193,25 @@ permissions: RrWw""")
         assert "RDATE;VALUE=PERIOD:20000102T000000Z/20000402T000000Z,20010102T000000Z/20010" in answer
         assert " 402T000000Z" in answer
 
+    def test_add_event_with_tz_trailing_space(self) -> None:
+        """Add an event."""
+        self.mkcalendar("/calendar.ics/")
+        event = get_file_content("event_issue2172.ics")
+        path = "/calendar.ics/event_issue2172.ics"
+        self.put(path, event)
+        _, headers, answer = self.request("GET", path, check=200)
+        assert "ETag" in headers
+        assert headers["Content-Type"] == "text/calendar; charset=utf-8"
+        assert "DESCRIPTION" in answer
+        assert "TZID:Mitteleuropäische Zeit " not in answer
+        assert "TZID:Mitteleuropäische Zeit" in answer
+        assert "TZNAME:Mitteleuropäische Zeit " not in answer
+        assert "TZNAME:Mitteleuropäische Zeit" in answer
+        assert "DTSTART;TZID=Mitteleuropäische Zeit :20260701T170000" not in answer
+        assert "DTSTART;TZID=Mitteleuropäische Zeit:20260701T170000" in answer
+        assert "DTEND;TZID=Mitteleuropäische Zeit :20260701T183000" not in answer
+        assert "DTEND;TZID=Mitteleuropäische Zeit:20260701T183000" in answer
+
     def test_add_event_with_desc_ok(self) -> None:
         """Add an event."""
         self.mkcalendar("/calendar.ics/")