I'm trying to get a clear picture of how pooled storage for an M365 tenant works, especially when compared to OneDrive usage. From what I understand, pooled storage starts at 1TB plus an additional 10GB for each licensed user. But this seems a bit tricky since each OneDrive account has a default storage of 1TB, which can be increased to 5TB.
It feels like this setup could lead to issues unless most of the users barely touch their allocated space. I'm looking to find out how to check the current available space in the pooled storage and how much of that is actually being used for OneDrive. Any insights would be really helpful!
4 Answers
To clarify, the pooled storage you're talking about applies to SharePoint and isn’t part of individual OneDrive allocations. Each OneDrive account generally starts at 1TB, which can go up to 5TB — but importantly, this does not diminish the SharePoint Online storage. So even if all users had the max OneDrive space, your tenant's pooled storage would remain intact as long as they manage their use properly.
Just to add something, the pooled storage actually refers to the total for your organization, which includes SharePoint space, but not the total for individual OneDrive accounts. If you have 100 users, that means you’re getting 1TB for the tenant plus an additional 10GB for every user. So it adds up! Better to encourage folks to utilize their personal spaces rather than the pooled areas when possible.
Also, let’s not forget about policies regarding data retention. If you have a compliance policy that requires keeping certain data on OneDrive even after a user leaves, that situation can complicate things. You may end up drawing from the pooled storage if data retention comes into play after a license is removed.

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