After you enroll your organization in Outlook Live, users may have the following questions that directly affect their e-mail experience:
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Are any sending size limits applied to e-mail messages?
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What recipient limits are applied to e-mail messages?
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Does my Outlook Live organization have a mailbox quota?
The limits on messages, mailboxes, recipients, and e-mail clients fall into one of the following categories:
You can't modify these limits, but you and your users should be aware of them.
These limits are applied to every e-mail message.
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Message limit
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Value
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Message size limit The maximum total size of an e-mail message. The total size includes the message header, the message body, and any file attachments.
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25 MB
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File attachment size limit The maximum allowed size of a single file attachment in an e-mail message. The message may contain many attachments that greatly increase the overall size of the message. However, the attachment size limit only applies to the size of an individual attachment.
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18 MB
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File attachments limit The maximum number of file attachments allowed in an e-mail message. Even if the total size of all the file attachments doesn't violate the message size limit, there is still a limit on how many attachments are allowed in the message.
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125 attachments
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Subject length limit The maximum number of text characters allowed in the subject line of an e-mail message.
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255 characters
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Multipart message limit The maximum number of message body parts that are allowed in a MIME multipart message.
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250 parts
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Embedded message depth limit The maximum number of forwarded e-mail messages that are allowed in an e-mail message.
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30 embedded messages
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These limits are applied to every mailbox.
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Mailbox limit
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Value
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Mailbox quota The maximum allowable size of a mailbox.
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10 GB
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Issue a mailbox quota message When a mailbox reaches the size specified by this limit, a warning message is displayed.
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9 GB
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Prohibit send When a mailbox reaches the size specified by this limit, no e-mail messages can be sent from the mailbox. Any attempt to send messages from a mailbox that has reached this size will generate an error message that explains the limit.
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9.668 GB
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Prohibit receive When a mailbox reaches the size specified by this limit, no e-mail messages can be successfully delivered to the mailbox. Any messages that are sent to a mailbox that has reached this size are returned to the sender with an error message that explains the limit.
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9.668 GB
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Recipient and sender limits
These limits are applied to messages, senders, or recipients to combat spam and mass-mailing worms or viruses.
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Limit
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Value
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Recipient limit The maximum number of message recipients allowed in the To:, Cc:, and Bcc: fields. A public group is counted as a single recipient.
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100 recipients
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Message rate limit The maximum number of e-mail messages that can be sent from a single Outlook Live e-mail client per minute. The client is identified by its IP address.
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30 message per minute
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Recipient rate limit The maximum number of recipients that can receive e-mail messages sent from a single Outlook Live e-mail account per day.
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250 recipients per day
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These limits control the amount of time that items in specific folders in the Inbox are accessible.
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Retention limit
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Value
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Deleted Items folder retention period The maximum number of days that items can remain in the Deleted Items folder before they are automatically removed.
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Unlimited
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Retention period for items removed from the Deleted Items folder the maximum numbers of days that items removed from the Deleted Items folder are retained before they are permanently deleted.
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14 days
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Junk E-mail folder retention period The maximum number of days that items can remain in the Junk E-mail folder before they are automatically removed.
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30 days
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