You can use a software called Parallels.  It turns your Mac into a PC.

Do you use this product and know that it works well?

I am a Software Engineer at Sage and I actually build the Sage 50 software on a Mac every day.  I use a product called VMware Fusion.  This software essentially allows you to create a virtual PC that runs inside a window on your Mac.  You can install pretty much any Windows OS you want inside the virtual PC environment, then install any Windows Apps you want as you normally would on a real PC.

www.vmware.com/.../overview.html

Parallels should work just fine as well, but I have not used it first hand.

thanks Tommy, sounds like this is a good product.  I have windows xp on my current computer and over the past three years I have twice had windows corrupted to where I had to format the drive and reload everything.  Both times it was caused when i was loading other software on it.  it wasn't fly by night software, the last one was an upgrade to Nuance Paperport version 14.  I'd been running Paperport for years for my scanner software.  Anyway the install process somehow deleted the NTLDR file in windows and when I rebooted after loading the software, windows was toast.  Pretty much the same thing happened the previous time.  So after this has happened twice, I've pretty much had it with Windows.  I have to wonder though, using VMWare, do you think the same thing can happen with the windows side.  I know the Mac pretty well firewalls the OS, but would that apply to windows on the MAC?  

That can still happen to your virtual PC running under VMWare unfortunately.  However, you are better off because you can set up your virtual PC just the way you like it, install all of your programs, etc., then don't actually use that PC, but instead make a copy of it and use the copy.  The next time Windows gets messed up, just throw away the corrupted copy and make a new copy from your original.  The catch here is that you have to make sure that any of your important data files (such as your Sage 50 data path) are on a network share and not the virtual PC.  If you don't have a network, you can share your home folder from your Mac and it will look like a network share to the PC.  If the important data files are on your Mac or another network server, then when you throw away the corrupted virtual PC you won't lose any data.  However, you will lose whatever is stored on the virtual PC if you can't boot it up and copy it off... just like you would with a real PC.

That's a really interesting idea.   I am not on a network, so if I had a Mac, then you are saying I could create a virtual PC with VM Ware, load windows, load Sage50 and whatever other PC programs I need, then create a copy off them (which I am assuming is just a matter of copying the folders where they were loaded (as well as the registry it created) into a second virtual PC).  Keep the original as the "master" and set the data path for Sage and any other PC programs I load to a file location that is on the MAC .  Really interesting that the virtual PC can communicate and save data outside the virtual PC.  if windows on the virtual machine crashes, under this setup, then it's not really that big a deal because the data is unscathed and recreating a new virtual machine is just a matter of copying over the programs off the "master".   Do I have this correct?  Sounds rather easy as well as ingenious.....  

That is correct.  I do it all the time.  It is a great setup.

When you create a new virtual PC, you have the option to create one with an empty hard drive and install the OS from scratch, or to make a copy of the hard drive from another virtual PC.  So the VMware software makes it very easy to do this.

The virtual PC sees the Mac as though they were connected to each other over a network, so you can share a folder on your Mac and store files to it from the PC.  I think by default it shows up as the Z:\ drive.  It puts a shortcut to the Mac folder on your Windows desktop in the virtual PC.  The software makes this very easy to do as well.

Another advantage is that you can create as many of these virtual PCs as you want (limited to hard drive space of course), so if you have some PC apps that aren't really compatible with each other you can put each one on a separate virtual PC and keep them isolated.  That is also a good way to isolate a "bad" app that notoriously crashes your system so that it won't impact your other apps.  Depending on how powerful your Mac is, you can even run 2 or 3 of these PCs at the same time and switch back and forth between them.  If you don't have a Mac yet, pretty much any new Mac will be powerful enough to do this, but I recommend that you get as much memory as you can if you plan to run multiple PCs at the same time on a regular basis.  If you only plan to run one at a time, pretty much and new Mac should be able to handle that just fine.

That is just awesome.   I need a new computer and REALLY did not want to buy a PC.  It is great to hear all this first hand and know it actually works.  Thanks you for your time and input!!!!!!

Oh, a couple more quick  questions, after you load Windows on the virtual machine, do you have to load drivers also like you do on a PC?  

Also, which version of Windows do you suggest for Sage50?  7 or 8?