Task Manager/To Do List

[Sunshine10]

I work in a Tax & Financial Services office. We, just like many offices I am sure, are attempting to keep up with the "times" and we have tried our best to become a paperless office. In this effort, we have been attempting to use MS Outlook's Tasklist to try and manage our ongoing work, i.e. notices client recieved from state or IRS & other things that require steps to be taken in order to reach a completion. Outlook's tasklist does not seem to be working the best for our needs, wondering if anyone else out there has such a similar need for a task manager/to do list program and can put me in the right the direction of a software that is easy to learn and manage & is compabitable with Windows XP Small Business, Adobe Acrobat, etc.