| Feature | Exchange Online Plan 1 | Exchange Online Plan 2 |
| Storage limits across standalone plans | ||
| User mailboxes | 50 GB | 100 GB |
| Archive mailboxes | 50 GB | 1.5 TB |
| Shared mailboxes | 50 GB | 50 GB |
| Resource mailboxes | 50 GB | 50 GB |
| Public folder mailboxes | 50 GB | 100 GB |
| Group mailboxes | 50 GB | 50 GB |
| Message limits across standalone options | ||
| Message size limit – Outlook | 150 MB | 150 MB |
| Message size limit – OWA | 112 MB | 112 MB |
| Message size limit – Outlook for Mac | 150 MB | 150 MB |
| Message size limit – migration | 150 MB | 150 MB |
| Message size limit – Outlook for iOS and Android | 33 MB | 33 MB |
| Size limit for encrypted messages (for subscribers using Microsoft Purview Message Encryption)6 | 100 MB | 100 MB |
| Size limit for encrypted messages (for subscribers using Office 365 Message Encryption (deprecated))6 | 25 MB | 25 MB |
| Subject length limit | 255 characters | 255 characters |
| File attachments limit | 250 attachments | 250 attachments |
| File attachment size limit – Outlook | 150 MB | 150 MB |
| File attachment size limit – OWA | 112 MB3 | 112 MB |
| File attachment size limit – Outlook for Mac | 150 MB | 150 MB |
| File attachment size limit – Outlook for iOS and Android | 33 MB | 33 MB |
| Multipart message limit | 250 parts | 250 parts |
| Embedded message depth limit | 30 embedded messages | 30 embedded messages |
| Xem thêm tại: https://learn.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits | ||
