
1.Unlimited personal cloud storage in Plan 2 means that unlimited personal cloud storage (One drive for business) for qualifying plans for subscriptions of five or more users, otherwise 1 TB/user.
2.SharePoint Online Plan 1 and Plan 2 are purchased according to per user. For example, if you purchase 300 users, you will get 1 TB plus 10*300 GB.
3.In this situation, you could add storage space for your subscription.
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