[Spooky23]

Note the word relatively. Microsoft has over a billion paid office users. There’s probably another billion pirated users. Google is a few hundred million, and has low penetration into institutions. 3-4 US state governments use Google in a paid capacity. 50 states use Microsoft.

Also, generally speaking, it is preferable to preserve original documents for archival purposes. Export to other formats is problematic in those cases, especially as time marches on and you end up making exported copies of copies.