What’s odd to me is that this experience is inconsistent with other mailboxes that were previously moved to Exchange 2016 and Outlook is connecting without issue.Įssentially what happens after an existing mailbox has been moved to Exchange 2016 and the Outlook client is restarted, the autoconfiguration process fails during the “Log on to server” task.Īs a result, Outlook is never able to attach to the mailbox on Exchange 2016 or update the existing profile. One of the latest issues I’ve experienced has been with an Outlook client (2010 or newer) not connecting to a mailbox that has been moved to (or even newly created in) Exchange 2016. If you are running an older CU version of Exchange and can’t directly upgrade to the latest CU see March 2021 Exchange Server Security Updates for older Cumulative Updates of Exchange Server.Lately, it seems as if I run across some new issue or anomaly on a weekly basis after implementing Exchange 2016 for one customer or another. It’s quite frustrating but it does wonders for building a personal knowledge base. These security updates are also included in Exchange 2019 CU9 and Exchange 2016 CU20. View: Microsoft Security Response Center (MSRC) Blog: Multiple Security Updates Released for Exchange ServerĮxchange 2016 CU19 – Download – KB5000871Įxchange 2016 CU18 – Download – KB5000871Įxchange 2013 CU23 – Download – KB5000871Įxchange 2010 SP3 RU32 – Download – KB5000978 View: Microsoft Security Blog: HAFNIUM targeting Exchange Servers with 0-day exploits View: On the Issue Blog: New nation-state cyberattacks View: Exchange Blog: Released: March 2021 Exchange Server Security Updates The update fixes the following Remote Code Execution Vulnerabilities

It is recommended that you start patching immediately beginning with server that are accessible from the Internet (like server publishing Outlook on the Web/OWA and ECP). The reason for this is because multiple zero-day vulnerabilities exist which are currently being exploited by a nation-state affiliated group. Out-of-Band security updates have been released for Exchange 2019, Exchange 2016, Exchange 2013 and even Exchange 2010 (which has been out of support since October 13, 2020).

Outlook 2019 with exchange 2010