diff --git a/user-guide/evolution_for_o365.md b/user-guide/evolution_for_o365.md
index 0c4e4a9..f9b4fb4 100644
--- a/user-guide/evolution_for_o365.md
+++ b/user-guide/evolution_for_o365.md
@@ -7,6 +7,11 @@ If you use an app or SMS, then you can set it up directly at [Microsoft](https:/
 
 For all the options check out the internal [knowledge base article](https://psi.service-now.com/kb_view.do?sysparm_article=KB0002928)
 
+## Software Installed?
+
+The package `evolution-ews` needs to be installed before starting.
+
+
 ## Configure Your Mail Account
 
 If you first open Evolution you get automatically to the "Mail Configuration Assistant", else you select in the "Edit" menu "Accounts", and then klick the "+Add" dropdown and select `Mail Account`. Then you should get