Few leftover Emails on old Exchange serevr after mailbox migration

I am in the process of moving mailboxes to a new server, most are going along fine. Some are leaving some messages behind on the old server but showing that they are on the new server. By that I mean when I run the command below some of the users have a number under the item count that I have already moved. When I look in the Exchange Management Console these mailboxes are on the new server.

Wondering if I view the messages or figure out what they are so I know if it is needed mail or corrupted or what.

Get-MailboxStatistics | Sort-Object TotalItemSize -Descending | ft DisplayName,@{label="TotalItemSize(KB)";expression={$_.TotalItemSize.Value.ToKB()}},ItemCount

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One recommendation that you should do to make when moving mailboxes. I would temporarily stop SMTP traffic while you move mailboxes to ensure no new mail is being left. This is especially true with high traffic users. Also keep in mind that corrupt messages can be left behind which is a good thing anyway.
ckeshavSr. Infrastructure SpecialistCommented:
How are you moving the Mailbox?

When the mailboxes are already on the new server the Mailbox statistics what you get by running the command will be from the new server.
ThorinOAuthor Commented:
I ended up finishing the migration with the Emails left on the other side. I have a EDB extraction tool that I am going to try on the database when I am done to see if I can export the EMails to a PST then import them on the other end.
ThorinOAuthor Commented:
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