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Topics Map > Communication and Collaboration > Office 365
Topics Map > Communication and Collaboration > Email

Office 365, Email, Exchange, Office 365 Exchange Limits

Various limits on Exchange Online

Office 365 Email Limits
  • 100 GB mailbox quotas for users
  • 50 GB mailbox quotas for unified groups
  • Maximum number of messages per mailbox folder: 1 million
  • Maximum number of messages per folder in the Recoverable Items folder: 3 million
  • Storage quota for Recoverable Items folder: 100 GB
  • Maximum number of subfolders per mailbox: 10,000
  • Maximum folder hierarchy depth: 300
  • Message size limit: 100 MB
  • Subject length limit: 255 characters
  • File attachments per message limit: 250
  • Messages received: 3,600 per hour
  • Recipient rate limit: 10,000 recipients per day
  • Recipient limit: 500 per message
  • Message rate limit (SMTP client submission only): 30 messages per minute
  • Maximum number of distribution group members: 50,000
  • Maximum message size for large distribution groups (>5,000 members): 2 MB
  • Exchange ActiveSync device limit: 100
  • Exchange ActiveSync file attachment limit: 25 MB
  • smtp.office365.com max concurrent connections per mailbox limit: 3
  • Junk Email folder retention period: 30 days
  • Password length limit for Outlook on the Web: 16 characters



Keywords:Office 365, Email, Exchange, Office 365 Exchange Limits   Doc ID:90634
Owner:Office 3.Group:University of Illinois Technology Services
Created:2019-03-26 10:08 CDTUpdated:2019-09-09 11:46 CDT
Sites:University of Illinois Technology Services
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