install Tbsync

user-guide/thunderbird_for_o365.md

@@ -82,5 +82,16 @@ This only needs to be done once, because after Thunderbird has marked the folder
 O365 seams to automatically put on server side a copy into the "Sent Items" folder, so Thunderbird does not need to do so.
 Go to "Copies & Folders" of your account and untick below "When sending messages, automatically:" the "Place a copy in:" option.
 
-Best you send now a test message and check if you get a copy in "Sent Items". 
+Best you send now a test message and check if you get a copy in "Sent Items".
+
+
+## PSI Email Adresses
+
+TODO
+
+## Calendar Integration
+
+TODO
+
+