Information on Exchange Online limits is provided by Microsoft and summarized below.
| Feature | Office 365 | BU Google |
| User Mailbox | 50 GB | No Limit |
| Message size limit (including attachments) | 100 MB | 25 MB (can receive 50 MB) |
| OWA/Outlook for Mac File attachment size limit | 25/35 MB | 25 MB |
| Deleted Items/Trash folder retention | No Limit | 30 days |
| Junk email folder retention | 30 days | 30 days |