diff --git a/user-guide/thunderbird_for_o365.md b/user-guide/thunderbird_for_o365.md
index 992dc3d8..36ace8c0 100644
--- a/user-guide/thunderbird_for_o365.md
+++ b/user-guide/thunderbird_for_o365.md
@@ -4,6 +4,7 @@ This guide shows how to access e-mail, address book and calendar with Thunderbir
 
 **Note**: Microsoft currently has a [problem with IMAP and IPv6](https://answers.microsoft.com/en-us/outlook_com/forum/all/thunderbird-imap-responded-user-is-authenticated/062a82f6-e678-4462-88b7-dd6cc318386f?page=3). Inside the PSI network IPv6 is not available, but from home it might be.
 
+
 ## Account and MFA ready?
 Before connecting to Thunderbird to Office365, you need to have your MFA (Multi-Factor-Authentication) token/app configured.
 
@@ -11,10 +12,12 @@ 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 `thunderbird` needs to be installed before starting.
 
+
 ## Import PSI TLS Interception CA Certificate
 
 Inside the PSI network access to E-Mail services using IMAP is protected by automatic malware scanning.
@@ -43,6 +46,7 @@ Here click on "Import..." and then select the previously downloaded and unpacked
 
 Now tick the checkbox "Trust this CA to identify websites" and confirm this and the previous dialog with "OK". Finally close the "Settings" tab.
 
+
 ## Configure Your Mail Account
 
 To add a new account open the hamburger menu on the top right. There choose "New" -> "Existing Mail Account...".
@@ -67,6 +71,7 @@ This is followed by a Microsoft login page where you need to enter your normal P
 
 With successful authentication you then close the "Account Setup" tab and enjoy the inbox or use one of the direct links for further configuration tuning, for some of them see the next two chapters.
 
+
 ## Use O365 Default Folders
 
 Thunderbird and O365 use by default different folders for sent and deleted messages.
@@ -75,6 +80,7 @@ Thunderbird and O365 use by default different folders for sent and deleted messa
 
 Via the hamburger menu at the top right open the "Account Settings" window.
 
+
 ### Folder for Deleted Messages
 
 ![Account Settings for Deleted Messages](thunderbird_for_o365/thunderbird11_deleted_folder.png)
@@ -83,6 +89,7 @@ Then select for your account "Server Settings" and there select the "Deleted Ite
 
 This only needs to be done once, because after Thunderbird has marked the folders once on the server any other Thunderbird instance connecting to it will automatically use the correct folder.
 
+
 ### Folder for Sent Messages
 
 ![No Sent Messages Copy](thunderbird_for_o365/thunderbird12_no_copy_of_sent_messages.png)
@@ -93,7 +100,7 @@ Go to "Copies & Folders" of your account and untick below "When sending messages
 Best you send now a test message and check if you get a copy in "Sent Items".
 
 
-## PSI Email Adresses
+## Addressbook with PSI Email Adresses
 
 ![Open Settings](thunderbird_for_o365/thunderbird01_open_settings.png)
 
@@ -156,11 +163,11 @@ The next time you write a new message and enter something into the "To" line,
 
 you need to enter your Windos/AD password and then it will also search the PSI wide user directory.
 
+
 ## Calendar Integration
 
 The calendar can be synchronized using the [TbSync](https://github.com/jobisoft/TbSync) add-on.
 
-
 ![Open Add-on Manager](thunderbird_for_o365/thunderbird60_open_addons.png)
 
 Open the hamburger menu at the top right and select "Add-ons and Themes".