Security News > 2023 > April > Microsoft fixes Outlook issue blocking access to emails, calendars
Microsoft has addressed a known issue affecting Outlook for Microsoft 365 customers that prevented them from accessing group mailboxes and calendars using the Outlook desktop client.
"A recent standard service update inadvertently contains an authentication code regression which is resulting in some users being unable to access or perform various Microsoft 365 group actions in the Outlook desktop client," the company described the issue under EX540503 in the Microsoft 365 admin center.
"Users may be unable to view or access Microsoft 365 group calendars and email messages in the Outlook desktop client."
The company advised them to switch to using Outlook Web Access or revert to Outlook Desktop build 16130.
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