Excuse my profound ignorance, but can servers be setup to dual-boot, triple-boot or even quadrupple-boot to different Linux/BSD operating systems? What is the maximum number of OS that can be booted on a server (or even a desktop for that matter)?

Thank you

We discussed this before, see here:

http://www.linuxquestions.org/questi...handle-302077/

I would like to add: It can get extremely complicated when you get past 2 OS's.

For most of the purposes that you'd want a server, you want it because you want the services that it provides to be there all of the time. In those circumstances, it doesn't make sense to dual boot servers, because some of the time the services won't be available.

There are some exceptions (if you need to occasionally boot some OS, because you need to answer the question 'Does this thing that I've been developing run under this other OS, or OS version?', for example) but many of these can also be dealt with via a VM, which might be more convenient.

VM meaning Virtual Machine correct?

Yes, exactly.