You can balance that recommendation with the need for caution, e.g.
This is expected, and supported, but you should plan to continue upgrading servers so that they are all updated within a reasonable period of time.
Edge Transport servers can be updated lastįor load-balanced servers and Exchange 2016 DAG members, there will be a period of time during which all servers are not at the same version. Order of Installation of Exchange 2016 UpdatesĬumulative updates for Exchange 2016 should be installed in the internet-facing site first, before installing in other sites in the organization. New DAG activation preference behaviour in Exchange 2016 CU2 (this is not a problem, but you need to be aware of it). Always use a CMD prompt to run Exchange setup, not PowerShell. Slow Installation of Exchange Server Updates on Windows Server 2012 R2. You should also be aware of the following issues: NET Framework on your servers to remain compatible with Exchange.Ĭomprehensive lists of known issues with cumulative update installation generally do not exist, however to improve your awareness of issues experienced by other customers, you should read the comments on the Exchange team blog entry for the relevant cumulative update, and check the TechNet forums for other reported issues. Check the Exchange Supportability Matrix and verify that you are maintaining the. Verify that your Exchange SSL certificates have not expired. Generally speaking you do not need to re-apply standard Exchange configurations that are set via the Exchange Admin Center or Exchange management shell (e.g. Verify that you have documented any customizations to your Exchange server that will need to be re-applied, such as custom OWA login pages, web.config changes, registry changes, or third party add-ons. 
Verify that you have confirmed, working backups of your Exchange servers and databases.Verify that you have confirmed, working backups of your Active Directory.You do not need to install all of the cumulative updates released between your current version and the latest version. You can download the latest cumulative update and upgrade an Exchange 2016 to the latest version in one update. Do not download from any third party websites. Download the cumulative update from Microsoft.Perform health checks and rebalancing of serversīefore you install any cumulative updates on your Exchange 2016 servers, you should first:.Update mailbox servers in any remaining internal sites (if any).Update mailbox servers in the internet-facing sites.Prepare by downloading update files, checking backups, and reviewing known issues.The steps for installing cumulative updates on Exchange 2016 are: This article will demonstrate the step by step process for installing cumulative updates for Exchange Server 2016.
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