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Recommended limits for Exchange Online mail items in folders


Topic Last Modified: 2013-10-16

Summary: Describes limitations for Exchange Online mail folders, such as item size and count.

You should be aware of the limitations that apply to Exchange Online messaging services. The Exchange Online Limits topic describes limits that apply to the following:

  • Email messages

  • Mailboxes

  • Mailbox size

  • Mailbox capacity alerts

  • Recipients and senders (to protect against spam, mass mailings, and malware)

  • Mail item retention

  • Distribution groups

  • Transport rules

  • Moderation settings

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