I would be surprised that the accountants wanted to go Mac simply for the accounting software. The economics are not there. So swaring off Mac big time, is probably hurting them more than anyone else.
The issue here is, don't expect software to run on different OS platforms in the same way. Most often, one platform is a port from the other. This inevitably causes some functionality loss or delayed time to market.
On the Mac you can run PC virtualisation, which apparently was encountering problems to the DONSELF1.
Has this issue been resolved because it is standard Parallels (or VMware fusion, or Bootcamp) functionality.