> I'm thinking of a context similar to [this post](https://meta.stackoverflow.com/questions/323148/should-i-encourage-people-to-use-the-localized-versions-of-so).
I'm familiar with the [conventions of pluralizing acronyms](http://english.stackexchange.com/questions/503/what-is-the-correct-way-to-pluralize-an-acronym), and that the poster would have had to use an apostrophe if they wanted to pluralize "S.O." instead of "SO".
Suppose that I had to spell out the name of the Stack Overflow company in the plural form. I can choose either of "Stack Overflows" or "Stack Overflow's". Which one is…