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You can import them into user mailbox.
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SAM2009

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Merge all PST files into one then import to office 365 user mailbox,
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Merge all PST files into one then import to office 365 user mailbox,

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Thanks for all your suggestions!
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Hi,<br />
<br />
I have a user which is migrated to O365 with E3 license. The user has many pst file in his computer, maybe 4 pst files with 4-5 GB each.<br />
<br />
What can we do with that?
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Hi,

I have a user which is migrated to O365 with E3 license. The user has many pst file in his computer, maybe 4 pst files with 4-5 GB each.

What can we do with that?

What to do with user pst file when he is on O365?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

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.