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This morning I have updated all MX records. TTL was set to 60 seconds, so updating shouldn't take too long I hope. In EAC there is no action required for the domains anymore. So the next step is to decommission the on premises Exchange Servers.<br />
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First I still have to export some not migrated mailboxes to a pst file. Then remove these accounts. <br />
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Then power off the Exchange Servers for a few days and monitor for issues.<br />
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Public Folders were not used and are as good as empty. I will check the Deleted Item Recovery settings, make a last back-up. Then start the database deletion. How to delete the database? Dismount the store and remove the databases? Then remount to an empty database? <br />
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Next delete Recipient Update Services. Exchange Online no more uses Recipient Update Services.<br />
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Then the last step is to uninstall the Exchange servers.
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What is the best practice for removing the Exchange 2003 servers from the enterprise after having migrated all mailboxes to Exchange Online? The AD user accounts are now mail enabled to the Exchange Online mailboxes. The Exchange 2003 Management Console still show the mailboxes, but now with a red cross, after having run the cleanup agent.<br />
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How to safely remove all the users from the Exchange 2003 environment and remove all Exchange servers on premises?
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What is the best practice for removing the Exchange 2003 servers from the enterprise after having migrated all mailboxes to Exchange Online? The AD user accounts are now mail enabled to the Exchange Online mailboxes. The Exchange 2003 Management Console still show the mailboxes, but now with a red cross, after having run the cleanup agent.

How to safely remove all the users from the Exchange 2003 environment and remove all Exchange servers on premises?

Removing Exchange Server 2003 after a staged migration to Exchange Online

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.