Limitations with Microsoft 365:
Microsoft 365 Mailbox Staff Only | |
| Mailbox storage limit | 50GB |
| Message size limit | 20MB |
| Attachment limit | With individual attachments limited to 20 MB |
| Subject length limit | 255 characters |
| Recipient rate limit | 10,000 recipients per day. After the limit has been reached, messages can’t be sent from the mailbox until the number of recipients that were sent messages in the past 24 hours drops below the limit. |
| Recipient limit | 400 recipients, distribution group counted as one. |
| Message rate limit | 30 messages per minute |
| Retention period for items removed from the Deleted Items folder | 14 days |
| Maximum message size for large distribution groups (>5000 members) | 2 MB |
Microsoft 365 OneDrive | |
| OneDrive (sharepoint included) storage | 5TB |
| File and path length | Up to 400 characters |
| File upload Limit | 250 GB per file |
| Invalid file types | Files with a *.tmp or *.ds_store extension, desktop.ini, thumbs.db, or ehthumbs.db (Full list of file type cannot be added) Any file that’s currently open by an application. |
| Invalid characters in filename/folder | " * : < > ? / \ | |
| No. of Items (files & folders) can be synced to OneDrive | Up to 300,000 files |
For more information, you can refer to the following links:
- Exchange Online Limits
- Restrictions and limitations when you sync SharePoint libraries to your computer through OneDrive for Business
- Invalid file names and file types in OneDrive, OneDrive for Business, and SharePoint
- File name, length and character restrictions for SharePoint
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