Having worked at, and retired from, NASA for many years, we used all kinds of operating systems, including the Sun Systems.
All systems have their peculiarities, problems, etc. What is good is what you are used to. People are resistant to change until they become comfortable with the new change, then they become resistant to change again.
I have used Open Office for several years on the PC and for two years on the iMac. I have had not problems opening MS Office documents and saving them in Open Office format. The GUI is a little different and that is where the learning curve comes in, but is very doable, especially with the "help" feature.
Open Office is totally supported by open source software. If a person has the mind to create a module that will help the software, it can be submitted. It will be evaluated and if accepted, incorporated into the next release. The reason that it is a free software is because it is open source.
Most "bad guys," do not bother with trying to circumvent security with open source software, well, in my days they didn't.
Also, most web sites, forums, etc., are powered by MySql Database, which is open source, and pretty good security if managed right.
For the price, you can't beat Open Office.
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