Through this mixed-method evaluation study the authors investigated a pilot implementation of an open-source productivity suite for teachers in a K-12 public school district. The authors evaluated OpenOffice version 3.0 using measures identified by the technology acceptance model as predictors of acceptance and use of technology systems. During a four-week trial period, teachers rated the usefulness and usability of OpenOffice 3.0 and Microsoft Office. Results from quantitative measures and participant interviews revealed common perceptions of the software applications as well as common problems encountered by users. Based on these findings, implications and recommendations for larger scale implementations within a K-12 educational institution are discussed. (Contains 5 figures and 4 tables.)