Office 365 mailbox limits

Office 365 mailbox limits refer to the maximum amount of storage space and number of items (e.g., emails, contacts, calendar events) that a mailbox can hold. Here are the default limits for Office 365 mailboxes:

Storage Space:

• The default storage space for a new Office 365 mailbox is 50 GB.
• The maximum storage space for a mailbox is 100 GB.
• If you need more storage space, you can upgrade to a larger plan or purchase additional storage space.

Item Limits:

• The default item limit for a new Office 365 mailbox is 10,000 items (e.g., emails, contacts, calendar events).
• The maximum item limit for a mailbox is 50,000 items.
• If you need to store more items, you can increase the item limit by submitting a request to Microsoft Support.

Other Limits:

• The maximum number of folders in a mailbox is 100.
• The maximum number of subfolders in a mailbox is 1000.
• The maximum number of recipients in a single email message is 1000.
• The maximum number of attachments in a single email message is 250.

Limits for Specific Features:

• Large File Send: The maximum file size for sending attachments is 10 GB.
• Large File Receive: The maximum file size for receiving attachments is 20 GB.
• Calendar: The maximum number of calendar events is 10,000.
• Contacts: The maximum number of contacts is 10,000.

How to Check Your Mailbox Limits:

1. Log in to the Office 365 admin center.
2. Go to the "Users" section and select the user whose mailbox you want to check.
3. Click on the "Mailbox" tab and scroll down to the "Storage" section.
4. Check the "Storage used" and "Storage limit" values to see how much storage space is available.

How to Increase Your Mailbox Limits:

1. Log in to the Office 365 admin center.
2. Go to the "Users" section and select the user whose mailbox you want to increase.
3. Click on the "Mailbox" tab and scroll down to the "Storage" section.
4. Click on the "Edit" button next to "Storage limit" and enter the new limit value.
5. Click "Save" to apply the changes.

Note: Increasing mailbox limits may require additional storage space or a higher plan. Contact Microsoft Support for more information.