After reading some of the sec filings on Intuit it is clear that they are depending on new products and features to create future revenue. Though from looking at Quickbooks, they have rewrote the database interface and SDK. These improvements appear to be at the cost of imporved install ablities on Windows XP.
Putting my self in their shoes and if I was an accountant pulling the strings, ith a new release of windows comming out, the investment on extra testing for XP might of seamed unneeded. In the end with the amount of problems that it has caused is not going to be postivite for them on this year. Maybe next year they will increase the budget ? Or maybe they are just getting their customers to beta test the software even though they declare it as stable.
I can only guess that their stock will drop somewhat after losing a bit of market share and 2007 will be a better year due to more offerings.