Missing Exchange Emails

We have Office 365 with one Exchange box.

The user came from an IMAP setup with Outlook 2007.

We uninstalled Office 2007 after backup up all the mail to a PST (which we still have), setup Office 365 with his domain (all verified working correctly), and installed Office 365 on his computer.

We setup a new profile with the Exchange and it works.  However, it seems that the Exchange box is "eating" the mail when dragging it up from the open PST file in Outlook to the Exchange folder.

I have checked the AutoArchieve options and they are all off and I have searched his hard drive for archive*.*t on his computer without luck.

What is going on?  Where are all of these emails going?  We have done this before and dragging them up (from the PST to the Exchange folders) the Exchange server syncs and "absorbs" them if you will and it works automatically.
gta2011Asked:
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Vasil Michev (MVP)Commented:
Several thins you need to check. First of all, check if the messages are shown in OWA. If those are old messages, they will most likely be moved to the Archive mailbox, so check there as well. Lastly, you might need to change the folder type as explained here: http://www.slipstick.com/developer/code-samples/change-outlook-folder-type-export/
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gta2011Author Commented:
It looks like they are missing in OWA too?!

But they were there and dragged into Exchange from the IMAP PST file.  (I understand what you are saying above and we normal do Exchange to Exchange but figured that IMAP would be the same?)

What is the best way to do this?  Just have about 2GB on an active IMAP server or can have it in a PST and need to get it into an Office 365 Small Business Exchange mailbox?
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Adam ConnollyCommented:
I think a better option would be to "Import" the PST into the mailbox instead of dragging and dropping.  Make sure you highlight the entire mailbox when doing the import.

https://support.office.com/en-ie/article/Import-Outlook-items-from-an-Outlook-Data-File-pst-345ad0da-7bc0-4a02-9cb7-2d1cf48ba8e3
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gta2011Author Commented:
I believe we tried this before without sucess but you are saying that if we import a PST file from Outlook 2007 that as IMAP into Office 2013 that is Exchange (complete new profile from previous to avoid an configuration issues) it should import all the mail and when I click on a folder and see the mail, it should not "disappear"?  (What happended previously is that you would click on a folder in Outlook and upon seeing the data as it may be months or even years old, it would be "removed" one-by-one with user intervention!?)
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