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Topics Map > Communication and Collaboration > Email
Office 365, Email, Exchange, What are my Mailbox Size Limits?
What are my Mailbox Size Limits
Mailboxes for Users on the Exchange system have a hard limit of 100GB
Current Warnings:
- 98GB: Warning regarding Inbox Size
- 99GB: Unable to Send Email
- 100GB: Unable to Send and Receive Email
Additionally users may experience performance issues when exceeding the following thresholds:
Total Mailbox Items: 250,000
Total Calendar Items: 5,000
For more information regarding Exchange Online Limits please check out this document: https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits