Applies to: Sophos Home for MacOS 10.15.4+

What's happening: 

MacOS customers running Catalina MacOS 10.15.4+ will start receiving the following message:
Legacy System Extension 
Existing software on your system loaded a system extension signed by "Sophos", which will be incompatible with a future version of macOS. 

This is related to changes that will take place on future versions of MacOS (post Catalina 10.15.X), in which kernel System Extensions will no longer be needed.  More information here: About legacy system extensions

What to do:

No action required other than clicking OK -  Current protection is not impacted in any way, and this notification from Apple is just informational.
Sophos Home future versions will meet the new Apple requirements when the changes take place on next versions MacOS.

Related information

• Sophos Home - Using beta versions of MacOS
• Nothing happens when clicking the Allow button on macOS High Sierra 10.13
• Installing Sophos Home on Mac computers
• System Extension Blocked appears on new installations on MacOS