How to Export a user's mailbox from Exchange to PST

Open Exchange Management Shell

 Start – All Program – Microsoft Exchange server 2010 – Exchange Management Shell

 Enter the following command:
New-MailboxExportRequest -mailbox <user name> -filepath "\\ExchangeServerName\exchange_archive\Former_PSTs\<user name>.PST" –AcceptLargeDataLoss –BadItemLimit unlimited

Enter the following to check status of job:
Get-mailboxexportrequest -mailbox <>

Run the following command to remove the export requests:

Get-MailboxExportRequest | Remove-MailboxExportRequest