"The one upside to OneDrive's rate limits is they apply only to new uploads; after re-reading the details on Microsoft's 2015 blog post [...] and checking out the fine print on the current offer, it seems they won't delete previously uploaded files, nor deny access via downloading or sharing.".
That was a completely inaccurate conclusion to jump to. The truth of the matter is the polar opposite:
The body of the email featured in the screencap above reads, with emphasis mine:
Your [redacted]@live.com account is 5.8 GB over your storage limit of 5 GB.
You can no longer add or sync new documents or photos. Changes made to existing OneDrive files will not sync between devices or the web. If you remain over your storage limit, your account will be frozen on or after September 7, 2017, and you will not be able to view or edit your files.
Please remove 5.8 GB of files or purchase more storage to bring your account back to normal. [Right? Sure, let me hop right on that, you thieves. I mean, why can't I even access the files I'm entitled to keep on OneDrive after the time limit is up (5GB worth)?]
Luckily (well, I don't know how "luckily", since I don't like using any Google product besides search, but Google sure is coming in handy right now) I've got 15GB free storage on Google Drive - more than enough to keep what I've got going on and add a few files without having to pay M$ to "upgrade" to the still-limited storage they used to give away unlimited and for free.