diff --git a/src/java/davmail/exchange/ExchangeSession.java b/src/java/davmail/exchange/ExchangeSession.java
index 848d6419..f85c40c5 100644
--- a/src/java/davmail/exchange/ExchangeSession.java
+++ b/src/java/davmail/exchange/ExchangeSession.java
@@ -96,17 +96,6 @@ public abstract class ExchangeSession {
     protected static final String JUNK = "Junk";
     protected static final String UNSENT = "Unsent Messages";
 
-    /**
-     * Various standard mail boxes Urls
-     */
-    protected String inboxUrl;
-    protected String deleteditemsUrl;
-    protected String sentitemsUrl;
-    protected String sendmsgUrl;
-    protected String draftsUrl;
-    protected String calendarUrl;
-    protected String contactsUrl;
-    protected String outboxUrl;
     protected String publicFolderUrl;
 
     /**
@@ -114,7 +103,7 @@ public abstract class ExchangeSession {
      */
     protected String mailPath;
     protected String email;
-    private String alias;
+    protected String alias;
     protected final HttpClient httpClient;
 
     private final String userName;
@@ -812,37 +801,6 @@ public abstract class ExchangeSession {
         sendMessage(properties, mailBuffer.toString());
     }
 
-    /**
-     * Convert logical or relative folder path to absolute folder path.
-     *
-     * @param folderName folder name
-     * @return folder path
-     */
-    public String getFolderPath(String folderName) {
-        String folderPath;
-        if (folderName.startsWith(INBOX)) {
-            folderPath = folderName.replaceFirst(INBOX, inboxUrl);
-        } else if (folderName.startsWith(TRASH)) {
-            folderPath = folderName.replaceFirst(TRASH, deleteditemsUrl);
-        } else if (folderName.startsWith(DRAFTS)) {
-            folderPath = folderName.replaceFirst(DRAFTS, draftsUrl);
-        } else if (folderName.startsWith(SENT)) {
-            folderPath = folderName.replaceFirst(SENT, sentitemsUrl);
-        } else if (folderName.startsWith(CALENDAR)) {
-            folderPath = folderName.replaceFirst(CALENDAR, calendarUrl);
-        } else if (folderName.startsWith(CONTACTS)) {
-            folderPath = folderName.replaceFirst(CONTACTS, contactsUrl);
-        } else if (folderName.startsWith("public")) {
-            folderPath = publicFolderUrl + folderName.substring("public".length());
-            // absolute folder path
-        } else if (folderName.startsWith("/")) {
-            folderPath = folderName;
-        } else {
-            folderPath = mailPath + folderName;
-        }
-        return folderPath;
-    }
-
     /**
      * Get folder object.
      * Folder name can be logical names INBOX, Drafts, Trash or calendar,
@@ -2479,46 +2437,7 @@ public abstract class ExchangeSession {
      * @return Exchange folder path
      * @throws IOException on error
      */
-    public String buildCalendarPath(String principal, String folderName) throws IOException {
-        StringBuilder buffer = new StringBuilder();
-        // other user calendar => replace principal folder name in mailPath
-        if (principal != null && !alias.equalsIgnoreCase(principal) && !email.equalsIgnoreCase(principal)) {
-            LOGGER.debug("Detected shared calendar path for principal " + principal + ", user principal is " + email);
-            int index = mailPath.lastIndexOf('/', mailPath.length() - 2);
-            if (index >= 0 && mailPath.endsWith("/")) {
-                buffer.append(mailPath.substring(0, index + 1)).append(principal).append('/');
-            } else {
-                throw new DavMailException("EXCEPTION_INVALID_MAIL_PATH", mailPath);
-            }
-        } else if (principal != null) {
-            buffer.append(mailPath);
-        }
-
-        if (folderName != null && (folderName.startsWith("calendar") || folderName.startsWith("contacts")
-                // OSX address book name
-                || folderName.startsWith("addressbook"))) {
-            if (folderName.startsWith("calendar")) {
-                // replace 'calendar' folder name with i18n name
-                buffer.append(calendarUrl.substring(calendarUrl.lastIndexOf('/') + 1));
-            } else {
-                // replace 'contacts' folder name with i18n name
-                buffer.append(contactsUrl.substring(contactsUrl.lastIndexOf('/') + 1));
-            }
-
-            // sub calendar folder => append sub folder name
-            int index = folderName.indexOf('/');
-            if (index >= 0) {
-                buffer.append(folderName.substring(index));
-            }
-            // replace 'inbox' folder name with i18n name
-        } else if ("inbox".equals(folderName)) {
-            buffer.append(inboxUrl.substring(inboxUrl.lastIndexOf('/') + 1));
-            // append folder name without replace (public folder)
-        } else if (folderName != null && folderName.length() > 0) {
-            buffer.append(folderName);
-        }
-        return buffer.toString();
-    }
+    public abstract String buildCalendarPath(String principal, String folderName) throws IOException;
 
     /**
      * Test if folderPath is inside user mailbox.
diff --git a/src/java/davmail/exchange/dav/DavExchangeSession.java b/src/java/davmail/exchange/dav/DavExchangeSession.java
index 68da1185..ea83c84f 100644
--- a/src/java/davmail/exchange/dav/DavExchangeSession.java
+++ b/src/java/davmail/exchange/dav/DavExchangeSession.java
@@ -74,6 +74,102 @@ public class DavExchangeSession extends ExchangeSession {
         WELL_KNOWN_FOLDERS.add(Field.get("outbox").davPropertyName);
     }
 
+    /**
+     * Various standard mail boxes Urls
+     */
+    protected String inboxUrl;
+    protected String deleteditemsUrl;
+    protected String sentitemsUrl;
+    protected String sendmsgUrl;
+    protected String draftsUrl;
+    protected String calendarUrl;
+    protected String contactsUrl;
+    protected String outboxUrl;
+
+    /**
+     * Convert logical or relative folder path to absolute folder path.
+     *
+     * @param folderName folder name
+     * @return folder path
+     */
+    public String getFolderPath(String folderName) {
+        String folderPath;
+        if (folderName.startsWith(INBOX)) {
+            folderPath = folderName.replaceFirst(INBOX, inboxUrl);
+        } else if (folderName.startsWith(TRASH)) {
+            folderPath = folderName.replaceFirst(TRASH, deleteditemsUrl);
+        } else if (folderName.startsWith(DRAFTS)) {
+            folderPath = folderName.replaceFirst(DRAFTS, draftsUrl);
+        } else if (folderName.startsWith(SENT)) {
+            folderPath = folderName.replaceFirst(SENT, sentitemsUrl);
+        } else if (folderName.startsWith(CALENDAR)) {
+            folderPath = folderName.replaceFirst(CALENDAR, calendarUrl);
+        } else if (folderName.startsWith(CONTACTS)) {
+            folderPath = folderName.replaceFirst(CONTACTS, contactsUrl);
+        } else if (folderName.startsWith("public")) {
+            folderPath = publicFolderUrl + folderName.substring("public".length());
+            // absolute folder path
+        } else if (folderName.startsWith("/")) {
+            folderPath = folderName;
+        } else {
+            folderPath = mailPath + folderName;
+        }
+        return folderPath;
+    }
+
+    /**
+     * Build Caldav calendar path for principal and folder name.
+     * - prefix is current user mailbox path if principal is current user,
+     * else prefix is parent folder of current user mailbox path followed by principal
+     * - suffix according to well known folder names (internationalized on Exchange)
+     *
+     * @param principal  calendar principal
+     * @param folderName requested folder name
+     * @return Exchange folder path
+     * @throws IOException on error
+     */
+    public String buildCalendarPath(String principal, String folderName) throws IOException {
+        StringBuilder buffer = new StringBuilder();
+        // other user calendar => replace principal folder name in mailPath
+        if (principal != null && !alias.equalsIgnoreCase(principal) && !email.equalsIgnoreCase(principal)) {
+            LOGGER.debug("Detected shared calendar path for principal " + principal + ", user principal is " + email);
+            int index = mailPath.lastIndexOf('/', mailPath.length() - 2);
+            if (index >= 0 && mailPath.endsWith("/")) {
+                buffer.append(mailPath.substring(0, index + 1)).append(principal).append('/');
+            } else {
+                throw new DavMailException("EXCEPTION_INVALID_MAIL_PATH", mailPath);
+            }
+        } else if (principal != null) {
+            buffer.append(mailPath);
+        }
+
+        if (folderName != null && (folderName.startsWith("calendar") || folderName.startsWith("contacts")
+                // OSX address book name
+                || folderName.startsWith("addressbook"))) {
+            if (folderName.startsWith("calendar")) {
+                // replace 'calendar' folder name with i18n name
+                buffer.append(calendarUrl.substring(calendarUrl.lastIndexOf('/') + 1));
+            } else {
+                // replace 'contacts' folder name with i18n name
+                buffer.append(contactsUrl.substring(contactsUrl.lastIndexOf('/') + 1));
+            }
+
+            // sub calendar folder => append sub folder name
+            int index = folderName.indexOf('/');
+            if (index >= 0) {
+                buffer.append(folderName.substring(index));
+            }
+            // replace 'inbox' folder name with i18n name
+        } else if ("inbox".equals(folderName)) {
+            buffer.append(inboxUrl.substring(inboxUrl.lastIndexOf('/') + 1));
+            // append folder name without replace (public folder)
+        } else if (folderName != null && folderName.length() > 0) {
+            buffer.append(folderName);
+        }
+        return buffer.toString();
+    }
+
+
     /**
      * @inheritDoc
      */
diff --git a/src/java/davmail/exchange/ews/EwsExchangeSession.java b/src/java/davmail/exchange/ews/EwsExchangeSession.java
index a77ca077..c97774c9 100644
--- a/src/java/davmail/exchange/ews/EwsExchangeSession.java
+++ b/src/java/davmail/exchange/ews/EwsExchangeSession.java
@@ -458,6 +458,11 @@ public class EwsExchangeSession extends ExchangeSession {
         throw new UnsupportedOperationException();
     }
 
+    @Override
+    public String buildCalendarPath(String principal, String folderName) throws IOException {
+          throw new UnsupportedOperationException();
+    }
+
     @Override
     protected void loadVtimezone() {
         throw new UnsupportedOperationException();