Microsoft has grudgingly agreed to let current OneDrive users keep their 15GB of free cloud storage and 15GB of free Camera Roll “bonus” storage, rather than dropping you to 5GB as previously stated, but only if you’re aware of the offer and don’t mind a bit of spam.
To take advantage of the offer, visit this Microsoft page. Microsoft representatives said the company does not have a supplementary explanatory blog post or statement to add at the present, but they did supply the webpage address, whose URL lists it as a “preview” at the moment.
You’ve already navigated the first hurdle: since users have to manually opt in to the offer, OneDrive users who are unaware of the deal won’t be able to take advantage of it. And there’s a small catch: by selecting the offer, you agree “to receive promotional emails from OneDrive,” although Microsoft immediately says that you can unsubscribe as well—how to do that, however, isn’t exactly clear.
It appears that unchecking the “promotional email” box, then clicking the “Keep your free storage” button also appears to work. In response to a question from PCWorld, a Microsoft representative said that the wording is being changed to “make it more clear”.