After migration of mailbox from On-premises to Office 365 some sent items are missing.

After migration of mailbox from On-premises to Office 365 some sent items are missing.

How can I check if any item is hide in "sent" items folder? any power-shell command available?
Ghayur AbbasTechnical HeadAsked:
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
If you are using the Outlook application, check in the web version and see if the files are missing there as well. If not, the problem may just be a filter in your Outlook program.
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Vasil Michev (MVP)Commented:
You can check the amount of items stored in the Sent Items folder on the server via Get-MailboxFolderStatistics. Or, in Outlook, right-click on Sent Items, select Properties -> Folder Size -> compare Server Data and Local Data.
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David AtkinTechnical DirectorCommented:
How did you migrate the mailbox?
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Ghayur AbbasTechnical HeadAuthor Commented:
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David AtkinTechnical DirectorCommented:
The migration itself won't hide anything.  It may however skip items that it believes are corrupt. I don't believe that there is any logging for the actual import into Office365 from Azure (someone correct me if I'm wrong).

If the missing emails are old emails its worth checking to see if Outlook is configured to sync only a certain amount of emails (i.e. 1/2 years).  Failing that, I'd check to see if there are any Archive PST files that are on the users machine to see if they have been missed form the import.

You can use the Get-MailboxFolderStatistics command in PowerShell to find out how many items are in each folder for the users mailbox.  At least that way you can see if there is a large amount of mail missing. If so, I'd think about doing a re-import.
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Ajit SinghCommented:
Does this only happen with this specific user?  Try running Outlook with the /resetfolders switch, it should recreate any missing folders. Other than that, it might be just a case of a 'hidden' folder, you can check with some low-level utility such as MFCMAPI: https://erichelm.wordpress.com/2011/05/20/hidden-folders-in-outlook-and-exchange/

Similar threads:

https://social.technet.microsoft.com/Forums/en-US/9b6f56df-1f50-49d6-aff4-2a8e82fad907/sent-folder-missing-after-migration-to-365-microsoft-office-professional-plus-2016?forum=officeitpro

https://community.spiceworks.com/topic/1956837-office-365-mails-missing-from-sent-items

Try workarounds mention in this link:
https://kb.wisc.edu/page.php?id=45343

Hope this helps!
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Ghayur AbbasTechnical HeadAuthor Commented:
Done thanks a lot
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