UPDATE:
The scheduled maintenance was completed at 11:27 pm Eastern on 6/10/21. All systems are operating normally, though some users may be required to re-enter their credentials.
Simultaneous to this, we have received some reports of a Windows/Office update on the end-user side that prompts a “Windows Security” pop-up to occur repeatedly. If users are experiencing this issue, they may need to select “More options” in the window, then click “Use a Different Account” and manually enter the email address and password for the affected mailbox.
If you have any questions, please reach out to our support team.
ORIGINAL POST:
Our engineering team will be performing a needed maintenance period on our Legacy platforms, Thursday, 6/10/21, which will cause authentication failures in Hosted Exchange. The maintenance is expected to last 30-45 minutes, after which users will be able to re-log into Exchange. During this update, mail flow will continue without interruption and anything composed in the interim will be sent once the client is able to reconnect. Outlook Web Access will not be accessible during this time.