mailbox licensing

The mailbox licensing tag covers guidance on Microsoft 365 and Exchange Online decisions where mailbox quotas, subscription plans, and retained requirements intersect. Current coverage examines the move from 50 GB to 100 GB primary mailboxes for eligible Business Basic, Business Standard, and Business Premium customers, and explains why that change does not automatically make Exchange Online Plan 2 removable. Articles emphasize checking the quota actually applied to each mailbox in the tenant, rather than relying on older licensing spreadsheets or broad comparison tables. They also consider archive capacity and compliance requirements, which may continue to justify a plan even when a primary mailbox receives the larger quota.