Exporting mailboxes from Exchange 2013 to 2010. Not co-existing servers

Our firm is acquiring another smaller firm.  We are currently running Exchange 2010 and they are running Exchange 2013.  We have about 215 users and they have 25.  We will be pulling all apps and data into our datacenter and retiring their servers and existing domain leaving only a single domain controller and print server from our domain.  I need to export these mailboxes from the Exchange 2013 server over to our Exchange 2010 org.  They will not co-exist in the same forest.  In previous versions I have used Exmerge to save the mailboxes as pst files and then I imported these pst files into the other server.

I'm sure this is a PowerShell command and I think it's probably the MailboxExportRequest command.  I think this will export a mailbox to a pst.   How do I then import this into the 2010 Exchange server?  Do I need to simply have the account and empty mailboxes created and then run a similar command to pull this pst data into the associated mailbox on the 2010 server?  If so, will this copy over everything in the mailbox?  calendar, contacts, etc.
bguilliams100Asked:
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Jeff GloverSr. Systems AdministratorCommented:
If they are Running Exchange 2013 you should be able to export their mailboxes to PST using the Exchange 2013 Admin center. Or you can use powershell to do it. You have to make sure the user doing the exports has the correct rights
New-ManagementRoleAssignment –Role “Mailbox Import Export” –User “<username>”
You also need to have a share setup on a server somewhere. I have found that using the IP address instead of the servername in the powershell commands seems to have fewer issues.

To export the mailbox using powershell
New-MailboxExportRequest –Mailbox "user" -FilePath “\\Server\Share\username.pst”

Then create a new user account in Your AD, create a mailbox and then import the PST into the new mailbox

New-MailboxImportRequest –FilePath “"full path to pst file -Mailbox "user"

It will import everything.

Note:
If you want to export all the mailboxes in the 2013 org, you can run this
Get-Mailbox -Database “Database" | New-MailboxExportRequest -PstFolderPath “\\Server\Share”
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bguilliams100Author Commented:
Fantastic.  Thanks lvJeff.
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