Hi Cengiz Menteşe,
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Through machine translation software and I learned about your issue is related with Exchange Pst migration.
It is possible that only a part of your mails were moved to the new PST file due to the size of the PST file. If you move a large number of emails to a new PST file, it may not be able to accommodate all the emails. You can try compacting the PST file by following these steps:
- Right-click on the PST file and select Properties.
- Click on Advanced.
- Click on Compact Now.
This should reduce the size of the PST file and allow you to move all your emails to the new PST file. You can find more information on how to manage PST files in Microsoft Outlook in this Microsoft article.
Let me know if you have any other questions.
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