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Mailing and Address Book Limits

The following limits are built-in limitations to Office 365’s systems:

  • Address List: 1000
  • Mail Storage: 50 Gigabytes
  • Messages per Mail Folder: 1 Million
  • Message Size:
    • Outlook (Windows): 150 Megabytes
    • Outlook (Web): 112 Megabytes
    • Outlook (Mac): 35 Megabytes
  • Attachment Size:
    • Outlook (Windows): 150 Megabytes
    • Outlook (Web): 112 Megabytes
    • Outlook (Mac): 35 Megabytes
  • Mail Recipient Rate Limit: 10,000 messages per day
  • Maximum Recipients per message: 500
  • Mail Sending Rate Limit: 30 messages per minute
  • Maximum number of Distribution Group members (currently disabled): 100,000