remove outdated information

rhel8/software.md

@@ -317,7 +317,7 @@ A small list of packages managed by the Linux Team.
 - latest [Zoom client](https://zoom.us/download?os=linux)
 - latest [Webex client](https://www.webex.com/downloads.html)
 - latest [Slack client](https://slack.com/downloads/linux)
-- latest [NoMachine Desktop](https://downloads.nomachine.com/download/?id=3) and [NoMachine Enterprise Client](https://downloads.nomachine.com/download/?id=11)
+- latest [NoMachine Enterprise Client](https://downloads.nomachine.com/download/?id=11)
 - latest [Real VNC Viewer](https://www.realvnc.com/en/connect/download/viewer/), recommended for VNC remote access to Windows machines
 - `pli-assets` containing the PSI and the Customer Self Service logo, any hints about the source rpm are welcome
 - [mod_gearman v4.0.1](https://mod-gearman.org/download/v4.0.1/rhel8/x86_64/)

user-guide/thunderbird_for_o365.md

@@ -2,9 +2,6 @@
 
 This guide shows how to access e-mail, address book and calendar with Thunderbird.
 
-**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.