> for software you’re using day to day to achieve other, business central, goals...
...you should use something which is reliable, no more complicated than needed for the purpose, which assures documents made now can be read in the distant future, keeps your confidential information out of the wrong hands and which is sure to be available to anyone who needs to have access to it.
Doesn't really sound like Microsoft Office is a good fit if you ask me.
You want to use the same stuff your clients use, that’s guaranteed to look the same on their computer. So Office it is.
Well, you want to be using what your clients can read, it doesn't have to the the same software. This is true for most file formats - audio, video, image/graphics (the latter more restricted due to other entrenched proprietary formats) - but the 'office' space (no pun intended) is still suffering from decades of abuse of its position os operating system vendor by Microsoft. Windows is only getting worse with every release so it is just smart business sense to steer away from it and things depending on it. Microsoft Office is one of the few remaining reasons often quoted for staying with this deteriorating platform so there are other incentives to move away from it. The best moment for moving away from Windows was years - or decades - ago. The second best moment is now.