Microsoft announced an out of band security update earlier today for Exchange. ACNS maintains local Exchange servers used to manage our M365 environment and those servers will be updated tonight.
The security update was successfully installed on 1 of 2 Exchange servers. Exchange and M365 services are fully functional at this time. Additional work will be scheduled on the 2nd Exchange server in the coming days but in the interim, the 2nd server is offline. This does not present capacity issues and the online Exchange server is a VM hosted within a VMWare cluster, which provides adequate resiliency for the time being.
We do not expect service disruption to M365 services or email during the planned maintenance but the following may experience delays:
- Delivery of email that passes through M365 to local mail servers (ex: Mailman listservs and/or email to departmental hosted systems)
- Application of eID password resets to accounts in local Active Directory and M365
- Updates to Active Directory settings such as display names, email address, etc.
More information about the out of band update is available at https://techcommunity.microsoft.com/t5/exchange-team-blog/released-march-2021-exchange-server-security-updates/ba-p/2175901