You can restore an individual Exchange Online mailbox item to the location that it was backed up from.
Procedure
From the navigation pane, go to Protect > Office 365.
The Office 365 apps page appears.
In the App name column, click the app that contains the item that you want to restore.
The app page appears.
On the Mailboxes tab, select the mailbox that contains the item that you want to restore, click Restore, and then click Restore messages.
The mailbox contents appear.
You can restore mailboxes, folders or messages.
Note: To include deleted items, click the action
button, and then select Include deleted items.
To restore a mailbox, do the following:
In the left pane, select the checkbox for the mailbox,
Click the action
button, select Restore.
To restore a folder or a sub-folder, do the following:
In the left pane, expand the mailbox, and then click the folder or the sub-folder.
Click the action
button, select Restore.
To restore messages, do the following:
Either expand folders to navigate to the messages, or in the Search box, enter search terms in the search filter list.
For example, enter inbox for the Folder filter.
Select the check boxes for the messages.
Click Restore.
The Restore options dialog box appears, with options for restoring to the original location already selected.
For if the message exists, specify what to do with existing items:
To not overwrite existing items, select Skip
To overwrite existing items, select Unconditionally overwrite. If the existing items have not been modified then they are not overwritten during restore.
Click Submit.