3.1.0对VirtualBox来说是一个milestone。SUN发布了Beta Release。 Beta Release是开发中的产品，主要用于评估和测试，不能继承到商业应用中。
VirtualBox 3.1.0 Beta 1最新的特性：
- Teleportation (aka live migration); migrate a live VM session from one machine to another
- VM states can now be restored from arbitrary snapshots instead of only the last one, and new snapshots can be taken from other snapshots as well (aka branched snapshots)
- 2D video acceleration for Windows guests; use the host video hardware for overlay stretching and colour conversion
- The network attachment type can be changed while a VM is running
- Experimental USB support for OpenSolaris hosts making use of the latest USB enhancements in Solaris Nevada 124 and higher.
- Significant performance improvements for PAE and AMD64 guests (VT-x and AMD-V only; normal (non-nested) paging)
- Experimental support for EFI (Extended Firmware Interface)
- VirtIO network device support
VirtualBox 3.1.0 Beta 1存在的问题：
- Snapshots of VMs with multiple attached disk images is broken. Please do not use snapshots with such VMs
- Snapshots of VMs with empty DVD attachments is broken
- Snapshots with immutable images not expected to work correctly
