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Replace Windows, Excel needed
(sh.itjust.works)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I got it working under both Wine and Bottles for someone that needed it, but it was a real pain in the ass, and the reports on actually successfully doing so are hit or miss.
Found this solid write up on various options and results though, which sounds like it could be helpful for you while investigating: https://gist.github.com/eylenburg/38e5da371b7fedc0662198efc66be57b
LinOffice looks promising, thanks!