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Thanks for that link Vasil, just the information I needed.
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Thanks for that link Vasil, just the information I needed.

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I have taken over looking after a customer who have an on-premise domain with mailboxes in Office 365. Users are synced using Azure AD Connect.<br />
<br />
The problem I have encountered is that when anyone leaves, the customer converts the users mailbox to a shared mailbox. However, when they go to remove the user from the on-prem AD, the shared mailbox is soft-deleted the next time O365 synchronization occurs.<br />
<br />
I have restored them to a newly created shared mailbox using Powershell connected to Exchange Online but can anyone share how they deal with keeping mailboxes of leavers? Is there a better method than restoring soft-deleted mailboxes? <br />
<br />
Thanks
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I have taken over looking after a customer who have an on-premise domain with mailboxes in Office 365. Users are synced using Azure AD Connect.

The problem I have encountered is that when anyone leaves, the customer converts the users mailbox to a shared mailbox. However, when they go to remove the user from the on-prem AD, the shared mailbox is soft-deleted the next time O365 synchronization occurs.

I have restored them to a newly created shared mailbox using Powershell connected to Exchange Online but can anyone share how they deal with keeping mailboxes of leavers? Is there a better method than restoring soft-deleted mailboxes? 

Thanks

Removing On-Prem Users synced with 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

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Microsoft Azure is a cloud computing platform and infrastructure for building, deploying and managing applications and services through datacenters. It provides both platform-as-a-service (PaaS) and infrastructure-as-a-service (IaaS) services and supports many different programming languages, tools and frameworks, including both Microsoft-specific and third-party software and systems. Cloud Services is a PaaS environment and can be used to create scalable applications and services; there are specific software development kits (SDKs) provided by Microsoft for Python, Java, Node.js and .NET. Azure also has file and storage services, data management, analytics and DNS services.