I had been running Quickbooks on XP. I upgraded to Quickbooks 2010 for Mac so I wouldn't have to fire up the virtual machine and save some memory. Installed great.
It's when I went for some support that things started heading south quickly. Since this is a new company I know I needed some help getting the charts of accounts set up and equity accounts and all that fun stuff. I signed up for an hour of consulting.
Then the wheels started to come off. Intuit has this nifty flash based utility for scheduling time. But it doesn't run on Safari on a Mac. Luckily I had Firefox and it did come up.
I'm amazed that people don't test out their systems on different browsers running on different operating systems. Especially an outfit like Intuit. Just remember to have a very good test plan before you release anything.