Microsoft 365 Business: Exchange Online mailbox quota rises to 100 GB

Microsoft 365 Business Basic, Business Standard, and Business Premium now include an extra 50 GB of primary Exchange Online mailbox storage, raising the supported limit from 50 GB to 100 GB. The primary mailbox is the user's active inbox, calendar, and contacts. Microsoft delivers the increase as a licensing change through a new service plan, a named capability inside the product license, rather than as a new mailbox type. The packaging rollout started in June 2026 and continues through September 2026. You should verify the result per user, because not every mailbox in a tenant receives the extra quota at the same time.
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