DRAG DROP
Your company has two offices. The offices are located in New York and San Francisco.
You have an Exchange Server 2013 organization that contains two servers. The servers are
configured as shown in the following table.
The organization contains four mailbox databases. The mailbox databases are configured as shown
in the following table.
Recently, DB1 went offline because of a disk failure. The disk is restored and DB1 is mounted.
You discover that there are more than 10,000 email messages queued for delivery to DB1.
You need to preserve the messages and perform the following actions:
Export the messages queued for delivery to a different drive. Clear the messages queued for
delivery. Ensure that the messages queued for delivery to DB1 are delivered while preserving the
original message header information. Prevent duplicate messages.
Which four actions should you perform in sequence? (To answer, move the appropriate four actions
from the list of actions to the answer area and arrange them in the correct order.)
Answer: 
Does removing the messages as the last step pose a risk of message duplication if the queue was to suddenly start processing ?
I would have switched the bottom two in order.
I stand corrected. The way it is appears to be correct.
https://technet.microsoft.com/en-us/library/jj891103%28v=exchg.150%29?f=255&MSPPError=-2147217396
When you export messages from a queue, you don’t remove the messages from the queue. After you export the messages and successfully resubmit them by using the Replay directory, you should remove the suspended messages to avoid duplicate message delivery.
Don’t understand why, but it seems the bottom 2 steps are the right way around.