According to a post on Intuit’s site (here) will no longer be supporting versions of Quickbooks older than 2008.
Starting April 30, 2010, “extra features” in 2007/7.0 and older versions of Quickbooks will stop working, forcing users who want to use those features to upgrade to 2010/10.0. This includes payroll and other optional services Intuit provides with some versions of Quickbooks.
All technical support for 2007/7.0 and older is ending as well.
Consider yourself notified!