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High Availability and Business Continuity

Office 365
 

Topic Last Modified: 2013-05-07

Microsoft Exchange Online offers extensive retention and recovery support for an organization’s email infrastructure. This includes mailbox replication at data centers and the ability to restore deleted mailboxes and deleted items.

Exchange Online mailboxes are continuously replicated to multiple database copies, in geographically dispersed Microsoft data centers, to provide data restoration capability in the event of a local messaging infrastructure failure. For large-scale failures, service continuity management procedures are initiated.

For more information about how Microsoft protects your data, see Office 365 Trust Center.

Administrators can delete Exchange Online mailboxes by using the Office 365 admin center to delete the corresponding user account or remove the Exchange Online license, or by using the Remove-Mailbox cmdlet in remote Windows PowerShell. When a mailbox is deleted, Exchange Online retains the mailbox and its contents for 30 days by default. After 30 days, the mailbox is not recoverable. A recovered mailbox contains all of the data stored in it at the time it was deleted. Administrators can recover a deleted mailbox within the retention period by using the Office 365 admin center. To recover a deleted mailbox, administrators have to restore the corresponding Office 365 user account or reassign an Exchange Online license to the user account. For more information, see Delete or Restore User Mailboxes in Exchange Online.

Exchange Online enables users to restore items they have deleted from any email folder, including the Deleted Items folder. When an item is deleted, it's kept in a user's Deleted Items folder. It remains there until it's manually removed by the user or automatically removed by retention policies. By default, retention policies will automatically remove items from the Deleted Items folder after 30 days. Administrators can customize retention policies by using the EAC or remote Windows PowerShell.

After an item has been removed from the Deleted Items folder, it's kept in a Recoverable Items folder for an additional 14 days before being permanently removed. Users can recover the item during this 14-day period by using the Recover Deleted Items feature in Outlook Web App or Outlook. Using this feature eliminates the need for a mailbox restore. If a user has manually purged an item from the Recoverable Items folder, an administrator can recover the item within the same 14-day window by using the Single Item Recovery feature and remote Windows PowerShell. The Single Item Recovery period is 14 days by default, but administrators can increase this to a maximum of 30 days by using remote Windows PowerShell. To preserve messages for longer than 30 days, organizations can implement longer-term email preservation or time-based In-Place Holds. For more information, see:

 

Feature

Exchange Server 2013

Office 365 Small Business

Office 365 Small Business Premium

Office 365 Midsize Business

Office 365 Enterprise E1

Office 365 Education A2

Office 365 Government G1

Office 365 Enterprise E3

Office 365 Education A3

Office 365 Government G3

Office 365 Enterprise E4

Office 365 Education A4

Office 365 Government G4

Office 365 Enterprise K1

Office 365 Government K1

Mailbox Replication at Data Centers

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Deleted Mailbox Recovery

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Deleted Item Recovery

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

 

Feature

Exchange Server 2013

Exchange Online Plan 1

Exchange Online Plan 2

Exchange Online Kiosk

Mailbox Replication at Data Centers

No

Yes

Yes

Yes

Deleted Mailbox Recovery

Yes

Yes

Yes

Yes

Deleted Item Recovery

Yes

Yes

Yes

Yes

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