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if we have E3 licenses , and our mailboxes I believe will have 50 GB quota &nbsp;and emails are sitting there.<br />
&nbsp;so what is the advantage if we use retention policy, if we enable archive against user mailboxes in 365 portal, will user will have archive mailbox populated in his outlook<br />
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&nbsp;2) can I have any powershell which I can run to see which mailboxes are idle or in disabled state so I can convert to shared mailboxes
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if we have E3 licenses , and our mailboxes I believe will have 50 GB quota  and emails are sitting there.
 so what is the advantage if we use retention policy, if we enable archive against user mailboxes in 365 portal, will user will have archive mailbox populated in his outlook

 2) can I have any powershell which I can run to see which mailboxes are idle or in disabled state so I can convert to shared mailboxes

OFFICE 365

Windows PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and associated scripting language built on the .NET Framework. PowerShell provides full access to the Component Object Model (COM) and Windows Management Instrumentation (WMI), enabling administrators to perform administrative tasks on both local and remote Windows systems as well as WS-Management and Common Information Model (CIM) enabling management of remote Linux systems and network devices.

Powershell

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.

Outlook

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.