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:

Keywords:Exchange quota Email Limit Size Warning Calendar Items   Doc ID:47977
Owner:Office 3.Group:University of Illinois Technology Services
Created:2015-03-03 15:20 CDTUpdated:2022-11-16 16:24 CDT
Sites:University of Illinois Technology Services
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