On-Prem Exchange 2016 and 2019 Anti-Malware Issue

Happy New Year and welcome to 2022! On-prem Exchange 2016 and 2019 anti-malware issue! Mail flowing through on-prem Exchange will have the majority (if not all) messages queued with this… “Last Error: Message deferred by categorizer agent” Though it is stated that this issue started around midnight local times on Sat 1 Jan 2022, messages…

MapiExceptionTooComplex

As I am working toward decommissioning Exchange 2010, someone who has a mailbox in Exchange Online (EXO) was having an issue with staying connected to an on premises shared mailbox using Outlook. I proposed moving it to EXO to address the issue. While onboarding the mailbox to EXO, the move gave me an error that…

Exchange Hybrid Product Key Distribution Issue

Be advised of the following issue you may experience when working to migrate from on premises Exchange environment to Exchange Online and are planning to build an Exchange 2013 or 2016 server for the hybrid configuration. I had an experience very recently during a customer project where several attempts were made to acquire an Exchange hybrid product key and…