diff --git a/src/java/davmail/exchange/dav/DavExchangeSession.java b/src/java/davmail/exchange/dav/DavExchangeSession.java
index 4d149aaa..557b17cf 100644
--- a/src/java/davmail/exchange/dav/DavExchangeSession.java
+++ b/src/java/davmail/exchange/dav/DavExchangeSession.java
@@ -2779,7 +2779,7 @@ public class DavExchangeSession extends ExchangeSession {
                     }
                     propertyValue = getPropertyIfExists(properties, "htmldescription");
                     if (propertyValue != null) {
-                        mimeMessage.setContent(propertyValue, "text/html");
+                        mimeMessage.setContent(propertyValue, "text/html; charset=UTF-8");
                     } else {
                         propertyValue = getPropertyIfExists(properties, "body");
                         if (propertyValue != null) {
diff --git a/src/java/davmail/exchange/ews/EwsExchangeSession.java b/src/java/davmail/exchange/ews/EwsExchangeSession.java
index da2cae7e..e86dd5aa 100644
--- a/src/java/davmail/exchange/ews/EwsExchangeSession.java
+++ b/src/java/davmail/exchange/ews/EwsExchangeSession.java
@@ -535,7 +535,7 @@ public class EwsExchangeSession extends ExchangeSession {
                 if (propertyValue == null) {
                     propertyValue = "";
                 }
-                mimeMessage.setContent(propertyValue, "text/html");
+                mimeMessage.setContent(propertyValue, "text/html; charset=UTF-8");
 
                 mimeMessage.writeTo(baos);
                 if (LOGGER.isDebugEnabled()) {