Linux Guest Additions: Fixed issue when VBoxClient seamless service caused a crash of some X11 applications (bug #21132).Linux Guest Additions: Introduced initial support for kernel 6.1.Windows host: Shared Clipboard: Fixed issue when only 4Kb of host clipboard buffer was accessible to guest (bug #21149).macOS hosts: Fixed VM crash when the guest tries to access a microphone or webcam.macOS hosts: Re-introduced support for internal networking, this is considered a bit experimental still.macOS hosts: Added workaround for a bug in the Hypervisor framework on Catalina causing VERR_NEM_MAP_PAGES_FAILED errors when starting a VM.

Main: Fixed issue when VBoxSVC could become unresponsive if Extension Pack was not installed (bug #21167).Either lower the number of vCPUs to 1 or upgrade to BigSur or later where the issue does not occur Known issue: VMs having more than one vCPU configured will not work properly on macOS Catalina due to an unknown memory corruption issue.The following items were fixed and/or added: Virtual machine definitions can therefore easily be ported to other computers. The configuration settings of virtual machines are stored entirely in XML and are independent of the local machines. VirtualBox also comes with a full Software Development Kit: even though it is Open Source Software, you don't have to hack the source to write a new interface for VirtualBox. This makes it easy to control it from several interfaces at once: for example, you can start a virtual machine in a typical virtual machine GUI and then control that machine from the command line, or possibly remotely. VirtualBox has an extremely modular design with well-defined internal programming interfaces and a client/server design. Presently, VirtualBox runs on Windows, Linux, Macintosh, and Solaris hosts and supports a large number of guest operating systems including but not limited to Windows (NT 4.0, 2000, XP, Server 2003, Vista, Windows 7, Windows 8, Windows 10), DOS/Windows 3.x, Linux (2.4, 2.6, 3.x and 4.x), Solaris and OpenSolaris, OS/2, and OpenBSD. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as home use.

Mac os 9 for virtualbox