The schools are already teaching their students the Office TLE productivity suite, which was partly developed in Thailand, said a report in the Bangkok Post.
Cost savings was another factor that the schools had considered, said the report.
The director of a high school in the country said in the report that Microsoft software upgrades were expensive and would have cost a million baht (£15,062) to license 300 computers.
Although licence fees are not required with Office TLE, the program is not as convenient to use as Microsoft's suite, according to pupils interviewed.
From 1 September, China-made office suite Kingsoft WPS Office 2003 replaced Microsoft Office in Shanghai public schools, following a raid by anti-piracy officials and a demand to pay licence fees.
