Applies to: Sophos Home for MacOS 10.15.4+

What's happening: 

MacOS customers running Catalina MacOS 10.15.4+ will receive 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 took place in macOS 11 (Big Sur), in which kernel extensions are longer used. More information here: About legacy system extensions.

NOTE: Sophos Home 10.0.1 which supports macOS 11 is now available: See: Support for macOS 11- Big Sur which uses the supported 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.

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