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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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You can check the amount of items stored in the Sent Items folder on the server via Get-MailboxFolderStatistic<wbr />s. Or, in Outlook, right-click on Sent Items, select Properties -&gt; Folder Size -&gt; compare Server Data and Local Data.
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How did you migrate the mailbox?
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Migrated through <a href="https://outlook.office365.com/ecp" rel="ugc nofollow">https://outlook.office365.com/ecp</a>
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The migration itself won't hide anything. &nbsp;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). <br />
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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). &nbsp;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.<br />
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You can use the Get-MailboxFolderStatistic<wbr />s command in PowerShell to find out how many items are in each folder for the users mailbox. &nbsp;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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After migration of mailbox from On-premises to Office 365 some sent items are missing.<br />
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How can I check if any item is hide in &quot;sent&quot; items folder? any power-shell command available?
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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?

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

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.