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I don’t think the transition would be markedly more difficult for either, honestly. LibreOffice is actually a fork of OpenOffice, so they are more similar than different. Let’s face it, most office suites do the same basic functions, although it can take time to adjust to the quirks of the individual software. LibreOffice is not used as widely as OpenOffice, but most people agree that bug fixes and development is much quicker with LibreOffice.LibreOffice also has a smaller footprint than OpenOffice, which can be important with older machines.