I am under the impression that you work in an organization with limited budget.
I think the only approach now is to go up in the hierarchy, and really address it from ideological perspective, with support from administrators above:
- LibreOffice vs Office and the Digital Divide.
- Using LibreOffice and purchasing support from local, South-American companies vs. Microsoft. Sending money to help the U.S. economy vs. the local economy.
- Talk about Munich migration, and there was a recent article about an Italian city hall where the employees chose to migrate to LibreOffice to avoid a salary cut for everyone.
- As a school, as educators, we want to encourage legal software, discourage software piracy, but at the same time, not put a financial burden on our students and their families.
So, let the teachers know that this isn't "change just for the sake of change", but that there are valid arguments about it, and particularly arguments that are very compatible with the goals and philosophy of educators.
I used this at my school:
http://link.ssis.edu.vn/index.php?title=Technology_%40_SSIS/Software/Why_we_use_Free_SoftwareBased on these links:
http://fsfe.org/freesoftware/education/argumentation.en.htmlhttp://wiki.fsfe.org/Reasons_for_schools_to_use_Free_SoftwareGood luck!