Exchange 2010 Export Mailboxes to PST

Add Mailbox Import Export role to a role group (for example, to the Organization Management role group). 

In the Exchange Management Console (EMC), navigate to Toolbox in the console tree.

1. In the work pane, double-click Role Based Access Control (RBAC) User Editor to open the user editor in the Exchange Control Panel (ECP).
2. Provide credentials in the Domainuser name and Password fields for an account that has the permissions needed to open the user editor in the ECP. Click Sign in.
3. Click the Administrator Roles tab.
4. Select the role group you want to add members to and, then click Details.
5. In the Members section, click Add.
6. Select the users, USGs, or other role groups you want to add to the role group, and then click OK.
7. Click Save to save the changes to the role group.

To Export mailbox to a PST out of Exchange 2010 or 2013

Use EMS and type the following:

Create a folder called PSTs in the root of C: and Share with full rights to everyone

Run this command in EMS:

New-MailboxRequestExportRequest -Mailbox user -Filepath \localhostPSTsuser.pst

To See Progress type:

Get-New-MailboxExportRequest