> So, NT4 (and other older systems) are treated as legacy systems.

Yes, that's MS's plan, I think.

> Are there any viri that recognize that they are running under
> emulation and attack out of the bounds of the VM?

There's one that doesn't run correctly within a VM as of last week,
according to Slashdot, but I don't see how one could attack outside of the
VM without taking advantage of some buffer overflow within the VM software
itself.

> How much of a performance hit do you get running VMWare or vVPC on a
> PC -- or another way to ask, is it practical to run a production server
> box or a prodo desktop bo?

I run VMware Workstation, and for that, there's a significant performance
degradation to the host system, and the VM itself will typically run quite a
bit slower than the host system would if it were running the services
itself.

However, VMware also has two server virtualization products, which allow you
to run production servers in virtualization. This is the real reason why MS
bought VPC - not for desktop use, but for server virtualization. I'm very
interested in this right now, but I don't have any performance data yet. I
plan to set up a server virtualization environment for application
development soon, though.

> IF, so, how many can you run -- where do you hit a wall.

On my laptop, I hit a wall at two concurrent VMs, and each of those has to
be pretty bare-bones even for that. That's why I want to get a new laptop!
Each VM requires a significant amount of memory, and running them
concurrently taxes the CPU significantly too.

> On the Mac you can only run one VPC VM at at time but you can switch
> between them in a minute or so.

That would defeat the purpose of virtualization for me, in some cases.

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/
phone: 202-797-5496
fax: 202-797-5444
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