exchange 2007 to Office 365 PST No mail/folders visible after copy

I am migrating from SBS 2008/Exchange 2007 to Office 365.
I have chosen to upload .pst files for my mailboxes (i only have 10). I am using one very small mailbox as a test to get started.

My problem is that after I have imported the PST file, the contents of the user's mailbox are empty. No mail seems to have been copied.

I created the PST files using a 32bit Outlook 2007 client with Exchange PowerShell Export-Mailbox cmdlet. and followed the instructions here:
https://support.office.com/en-us/article/use-network-upload-to-import-your-organization-s-pst-files-to-office-365-103f940c-0468-4e1a-b527-cc8ad13a5ea6

Everything worked perfectly. I had created a new user in office 365 prior to uploading the pst file and given that user an Exchange Only license. I mapped the PST file to the user I had previously created. That seemed to be successful.

When I look at the mailbox usage for this user in Exchange Admin | recipients | mailbox users I see that the a small amount of the 50GB has indeed been used. However, when I log in - separately, on another computer - to outlook no messages have been copied. There are no filters set on outlook.

So it looks like the mapping is working correctly, because some of the mailbox space is definitely being used. But the messages are not visible.

Can any one tell me what I might be doing wrong?

By the way - when i set up Exchange in the first place, i added my domain names, but I didn't move the DNS records to point to Office 365. I want to move all the mail here first, then redelegate the DNS record as the last thing. So my users are set up as user@mydomain.com, but mydomain.com does not actually point here as yet. I did use mydomain.com in the mapping file, rather that the mydomain.onmicrosoft.com that office assigned to me. Could that be part of the problem? I'm assuming not, as the mailbox space has been used. But i thought it worth mentioning.

Thanks in advance!

Adam
adamianfAsked:
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timgreen7077Exchange EngineerCommented:
if you followed those steps exactly then it takes a little time for all the mail to show as being imported. it's not instantly. some of the mail may have been imported but it may be in a folder you didn't check or it could have been calendar items or anything. we use this method also when importing pst files and it does take time. if we import 8GB pst it could take a full day or so before all the mail finally finish importing. unfortunately you can't control the speed of the actual import since its controlled by Microsoft. just be patient because if everything was done successfully it will import.
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adamianfAuthor Commented:
oh okay. I'll wait and see for the weekend and get back to you.
Thanks.
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timgreen7077Exchange EngineerCommented:
just check it tomorrow sometime and you should start seeing mail if you performed the import correctly.
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Vasil Michev (MVP)Commented:
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Sandeep KumarAssociate ConsultantCommented:
Agree with timgreen's advice. Just wait a little more to view all emails.

Later, if the process is not done, then you can refer to https://www.nucleustechnologies.com/exchange-edb-to-office-365-migration.html to export Exchange mailboxes to Office 365 directly with the help of Kernel for Exchange Server recovery software.
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adamianfAuthor Commented:
Thank you all for your comments so far.
My original attempt to import a PST completed successfully over 36 hours ago. It was a 2.5GB file and the user i mapped this import to is showing 2.5GB of their mailbox allocation has been used. Yet when I use Outlook web to view this mailbox, there are only 10 email there, none of which are from the PST.

The PST file was from user@mydomain.com. The use they are mapped to is user@mydomain.onmicrosoft.com. I have not set up DNS delegation to point mydomain.com to onmicrosoft.com as yet. Could this have something to do with it?

Do you think it's reasonable to assume that - given the 2.5GB of mailbox space used - the PST has been successfully imported and the issue is between Exchange and Outlook?

Thanks again.
Adam
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timgreen7077Exchange EngineerCommented:
If you still don't see absolutely anything then the import wasn't performed correctly. You can view the status of the import in office 365.
Login into O365 portal > admin > admin centers > security and compliance > data governance > import.
This will show you any pst imports you have done or currently have going and their status. If you don't see your import that you perform then it was probably done incorrectly.

When you imported the required mapped csv file did it pass the verification check?
Also the the Name column for the mapped file is the name of the pst file (file.pst) and it is case specific.

Verify if you see the import and if not then it wasn't performed properly. Let me know if you have any additional questions.
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adamianfAuthor Commented:
About 36 hours ago, my messages finally started appearing. They all seem to be there now.
Thanks to everyone for your comments
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