On top of that, with the use of another Oracle VM VirtualBox feature called snapshots, one can save a particular state of a virtual machine and revert back to that state, if necessary. Once installed, a virtual machine and its virtual hard disks can be considered a container that can be arbitrarily frozen, woken up, copied, backed up, and transported between hosts. Installing and running a mail server becomes as easy as importing such an appliance into Oracle VM VirtualBox. With Oracle VM VirtualBox, such a complex setup, often called an appliance, can be packed into a virtual machine. For example, installing a complete mail server solution on a real machine can be a tedious task. Software vendors can use virtual machines to ship entire software configurations. Since you can configure what kinds of virtual hardware should be presented to each such OS, you can install an old OS such as DOS or OS/2 even if your real computer’s hardware is no longer supported by that OS. This way, you can run software written for one OS on another, such as Windows software on Linux or a Mac, without having to reboot to use it. Oracle VM VirtualBox enables you to run more than one OS at a time. Running multiple operating systems simultaneously. Oracle VM VirtualBox is useful in the following scenarios:
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