If you need more site collections in SharePoint Online, you’re in luck. “We’re announcing today that individual Office 365 tenants can now have up to 500,000 site collections (up from the previous limit of 10,000),” wrote Mark Kashman, senior product manager on the SharePoint marketing team, in a
post on the Office 36 team blog on 8-18-2014.
Plans affected: Office 365 Enterprise E1, E3, and E4; Office 365 Education A2, A3, and A4; Office 365 Government G1, G3, and G4; Office 365 Midsize Business. The catch is, Kashman writes, that Office 365 Small Business comes with only one site collection and Office 365 Government plans currently have a 100 GB per site collection storage limit.