can't fully export all my data to .pst file from exchange

I have an outlook client that is connected to an exchange server.  I have email going all the way back to 2004.  I exported my data to create a pst file.  However, when I uploaded it to my new mail server, I only see the email going back to 2010.  Why didn't all of it export?  Does it have anything to do with cache mode?
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Amit KumarCommented:
Try below powershell, you will have to keep a copy of a PST file on shared path then import it from Exchange Management shell in your mailbox:

New-MailboxImportRequest -Mailbox Ayla -FilePath \\SERVER01\PSTFiles\Recovered.pst -TargetRootFolder "RecoveredFiles" -IncludeFolders "#Inbox#"
al4629740Author Commented:
Amit I am unfamiliar with powershell.  Additinally, I will not have access to the Exchange Management console.  Could you add more clarity whether this will work in my case?
Amit KumarCommented:
see it totally depends on your PST if that is not corrupted. however when you moving mails from Outook so sometimes cache mode stuck. That is why I suggested to use powershell.. ask your administrators to do it for you.

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al4629740Author Commented:
Asking administrators to do it for me is not a solution in this case.  I need a method to export all the data without asking for the administrators help in this particular case.
Amit KumarCommented:
then do one thing configure your outlook with new profile may be existing outlook profile having issue in cache mode then move your e-mails from PST. but doing before anything please take backup of your PST.
al4629740Author Commented:
my outlook has .ost file.  Not pst file.   I can't import from .ost file
Amit KumarCommented:
do you have configured two mailboxes? 1 is from old mail server and 2nd is from new mail server?
al4629740Author Commented:
No.  One is an old exchange server and the new one is office 365.

Do I need to setup two?
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
"Asking administrators to do it for me is not a solution in this case.  I need a method to export all the data without asking for the administrators help in this particular case." - that sounds suspicious. You certainly do not mean to say "they may not know of that action", but "I cannot expect to get help from them"?!
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
I would try to set up an additional account for O365 in the same Outlook, and then just copy/move mails.
On the other hand, your PST export should work, unless there is some corruption, as stated by Amit.
Maybe there is archiving setup, which automatically moves old mails from exchange to archive.pst files, and so those mails would be local on the PC somewhere and no longer in the exchange mailbox.
al4629740Author Commented:
Do I really need to explain myself..... : )

It's not suspicious.  It's a unique circumstance.    That being said.  Thank you for your help.
Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
Did you check for archives and/or OST/PST corruption? The OST/PST scanning can be performed with scanpst.exe located in the Office program folder, or you can delete the OST (without Outlook running) and try let it rebuild by Outlook.
Vlastimil SopuchDirectorCommented:
What's your Office version & How big is the PST file you exported? There are size limitation dependent of the Office version.
Have you exported root of the mailbox in your Outlook including subfolders?
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