VirtualBox 6.0.0 is a major update. The following major new features were added:

• Implemented support for exporting a virtual machine to Oracle Cloud Infrastructure
• User interface: greatly improved HiDPI and scaling support, including better detection and per-machine configuration
• Major rework of user interface with simpler and more powerful application and virtual machine set-up
• User interface: a new file manager enabling user to control the guest file system and copy files between host and guest.
• Graphics: major update of 3D graphics support for Windows guests, and VMSVGA 3D graphics device emulation on Linux and Solaris guests
• Added support for surround speaker setups (as used by Windows 10 Build 1809)
• Added utility vboximg-mount on Apple hosts to access the content of guest disks on the host
• Added support for using Hyper-V as the fallback execution core on Windows host, to avoid inability to run VMs at the price of reduced performance

In addition, the following items were fixed and/or added:

• Execution core: fixed single-stepping in certain circumstances (bug #17316)
• User interface: video and audio recording can now be separately enabled
• Audio/Video recording fixes and improvements
• Audio: better support for attaching and detaching remote desktop connections
• Serial port emulation fixes
• Serial ports: allow changing the serial port attachment while a machine is running (bug #6115)
• Networking: Added a workaround for older guests which do not enable bus mastering for the virtio PCI device
• Networking: fixed wrong RCODE from DNS AAAA query with --natdnshostresolver1 (bug #18171)
• iSCSI: In cases where there is no ambiguity, the LUN of an iSCSI target is automatically determined, for targets with non-zero LUNs
• Transparently resize disk images when merging if possible
• VBoxManage: support for DHCP options
• Fixed VNC/RDP (bug 18153)
• Guest Control: various new interfaces and features (see SDK documentation)
• Linux hosts: support Linux 4.20 (thank you Larry Finger)
• Solaris: installer fixes
• Shared folders: performance improvements
• Guest Additions: improved shared folder auto-mounting
• Windows Guest Additions: fix incorrect tablet co-ordinate handling with recent Windows 10 builds
• Linux Additions: fix for building vboxvideo on EL 7.6 standard kernel, contributed by Robert Conde (bug #18093)
• Linux guests: support Linux 4.20 (thank you Larry Finger)
• Linux guests: support VMSVGA in the Linux and X11 Additions
• MacOS Guest Additions: initial support
• OS/2 Guest Additions: initial shared folder support
• BIOS fixes
• ACPI: Up to four custom ACPI tables can now be configured for a VM