Yes, there are two ways to do this.
1) All apple computers can dual boot (meaning they can be started as either in Windows or MacOS when you start the machine - Apple call this boot camp). So if you start in Windows then the computer works just like any other windows computer.
2) You can buy a piece of software called Parallels, and using this software you can run Windows from MacOS so there is no need to dual boot.
Either way works great for Sage Desk top (and for that matter QB Desktop).
If however, you are using Sage One or QB Online then you do not need windows since both of these are clould based and work fine from any MacOS browser.
On the basis, that both Sage and QB are moving more and more to cloud, any computer/tablet will run any could based accounting package.
Hope this helps.
Thank you very much for your help and advice, I am glad Sage will work on an Apple Desktop, I have an iphone and an ipad and I am hoping to link everything together, do you use an Apple computer for your business?
I use Sage 50 Accounts & Sage 50 Payroll, microsoft excel, word and outlook on a daily basis, do you recommend I buy Apple or have you any other recommendations?