Hyper V/VMware Workstaion not working but Virtual Box does?

Hi all.
Been testing with some VM host software and have found my self a little confused. Both Hyper V and VMware do not work however Virtual box does. The system is running server 2008 as a host and it is on a IBM X3650 7979 (M1). Due to it running on server 2008 VMware flat out refuses to install and Hyper V shows issues surrounding the hyperviser not running when it is.
My question is, why is virtual box working when hyper v is not? Does it do some sort of hardware emulation to get it to work on more systems?
Cheers!

Check your BIOS for options related to

long mode
VT-D
etc.

anything to do with virtualisation.

As you suspected, Virtualbox works without a lot of the VM options and uses software emulation (slower) to work around the lack of support. VMware and hyper-V do not. They require (some or all of - depending on what BIOS options you have listed) the VM support options to be turned on.

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