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And if the admin wants to make sure that the user doesn't find out his mailbox was accessed, he can use Search-Mailbox cmdlet along with the '-DeleteContent' parameter:<br />
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<a href="http://technet.microsoft.com/en-us/library/dd298173(v=exchg.150).aspx" rel="ugc">http://technet.microsoft.com/en-us/library/dd298173(v=exchg.150).aspx</a>
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And if the admin wants to make sure that the user doesn't find out his mailbox was accessed, he can use Search-Mailbox cmdlet along with the '-DeleteContent' parameter:

http://technet.microsoft.com/en-us/library/dd298173(v=exchg.150).aspx [http://technet.microsoft.com/en-us/library/dd298173(v=exchg.150).aspx]

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I have a client who wants to move to office 365 but has the following question that I was unable to find and answer to:<br />
<br />
Can an office 365 Administrator go in to any user’s mailbox and remove intra-company messages that were either sent in error or contain information that the recipient should not have received<br />
<br />
This answer is worth it's weight in gold. <br />
Thank you !!
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I have a client who wants to move to office 365 but has the following question that I was unable to find and answer to:

Can an office 365 Administrator go in to any user’s mailbox and remove intra-company messages that were either sent in error or contain information that the recipient should not have received

This answer is worth it's weight in gold. 
Thank you !!

Can an Office 365 Email Administrator remove intra-company messages sent in error

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.

Microsoft SharePoint

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

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.