Microsoft Office Tutorials and References
In Depth Information
Exchange Online capabilities
Exchange Online capabilities
Exchange Online is primarily responsible for mailbox access and securely preserving
contents. It is also responsible for initiating the delivery of email messages to internal and
external recipients. Based on the Exchange Online plan your organization subscribes to, it is
also responsible for storing voice mail content through its UM role.
Messaging limits
To maintain the availability and performance of Exchange Online, Microsoft imposes limits
on message size and number of recipients, and also throttles the rate that messages are
being sent.
For the most part, email administrators are familiar with and can appreciate the need for
such limits. Furthermore, you will find that these limits are much higher than those that are
currently in place at most organizations.
As of this writing, the messaging limits are as follows:
Maximum message size of 25 MB, including attachments.
10,000 recipients per day limit (where a distribution group is considered one
recipient). Therefore, if you use two distribution groups with 10,000 recipients in each
distribution group, Exchange Online sees that as two recipients when in reality the email
is sent to 20,000 recipients.
A single email can be addressed to a maximum of 500 recipients. A distribution
group is again considered one recipient.
Exchange Online throttles the rate of email delivery to 30 messages per minute for
each mailbox. Anything beyond 30 messages will be queued for delivery in
subsequent minutes. For example, if you send out 100 messages in rapid succession, the
messages will be delivered over the course of slightly over three minutes: 30
messages will be sent immediately, 30 more will be sent the second minute, 30 the third
minute, and the last 10 messages will be sent the fourth minute.
Exchange Online is not a mass-mailing service. If you need to send emails that are beyond
the specified limits, there are third-party services to help you responsibly send out bulk
emails and manage email campaigns.
Backup and recovery
Backups in Office 365 services are generally used to supplement disaster recovery
measures. Services in Office 365 are provisioned in an active-active synchronized configuration
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