Exchange Online is Microsoft's cloud-based email and calendaring service, offering the same core features as [[Microsoft Exchange]], such as email, calendar, and contacts, but hosted in the cloud for greater accessibility and scalability. It integrates with [[Microsoft 365]] and provides enhanced security, data loss prevention, and automatic updates, making it ideal for businesses seeking a cloud-first solution for communication and collaboration. # Limits Find the Exchange Online limits for various service areas, including address book limits, mailbox storage limits, and reporting and message trace limits, to name just a few.^[[Exchange Online limits - Service Descriptions | Microsoft Learn](https://learn.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#storage-limits)] ## Mailbox Storage Limits Please check the [original article](https://learn.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#mailbox-storage-limits) for additional details. | Feature | Microsoft 365 Business Basic and Standard | Microsoft 365 Business Premium | Microsoft 365 Enterprise E3/E5 | Office 365 Enterprise E1 | Office 365 Enterprise E3/E5 | Office 365 Enterprise F3 | | ------------------------ | ----------------------------------------- | ------------------------------ | ------------------------------ | ------------------------ | --------------------------- | ------------------------ | | User mailboxes | 50 GB | 50 GB | 100 GB | 50 GB | 100 GB | 2 GB | | Archive mailboxes7,8 | 50 GB | 1.5 TB | 1.5 TB | 50 GB | 1.5 TB | Not available | | Shared mailboxes10 | 50 GB | 50 GB | 50/100 GB2, | 50 GB | 50/100 GB | 50 GB | | Resource mailboxes | 50 GB | 50 GB | 50 GB3, | 50 GB | 50 GB | 50 GB | | Public folder mailboxes5 | 100 GB6 | 100 GB | 100 GB | 100 GB | 100 GB | 100 GB | | Group mailboxes | 50 GB | 50 GB | 50 GB | 50 GB | 50 GB | 50 GB | ## Storage limits across standalone plans |Feature|Exchange Server|Exchange Online Plan 1|Exchange Online Plan 2|Exchange Online Kiosk| |---|---|---|---|---| |User mailboxes|2 GB1|50 GB|100 GB|2 GB| |Archive mailboxes8,9|100 GB1|50 GB|1.5 TB2|Not available5| |Shared mailboxes11|2 GB1|50 GB3|100 GB3,10|50 GB3| |Resource mailboxes|2 GB1|50 GB4|100 GB4,10|50 GB4| |Public folder mailboxes|2 GB6|50 GB7|100 GB7|Not available| |Group mailboxes|50 GB|50 GB|50 GB|50 GB|