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Your shared mailbox can store up to 50GB of data without you assigning a license to it. After that, you need to assign a license to the mailbox to store more data. For more details on shared mailbox licensing, please see Exchange Online Limits.How much does Exchange Online cost?
Exchange Online (Plan 2) £6.00. user/month. (annual subscription–auto renews) Price does not include VAT. £9.40. Microsoft 365 Business Standard £9.40. user/month. (annual subscription–auto renews) Price does not include VAT.