"Access Denied" Error in New Outlook for Windows

Campus is actively tracking an ongoing service-level issue affecting New Outlook for Windows.

Outlook inbox displaying an "Access denied" message with a shield icon

Symptoms

  • Users may encounter "Access Denied" error messages
  • Sudden permission errors when attempting to open emails, shared calendars, folders, or shared mailboxes
  • Session disruptions including repeated prompts to re-enter credentials or re-authenticate via multi-factor authentication (MFA)
  • Random disconnections: Unplanned drops in connection to the mail server
  • Drafting Glitches: Freezing, input delays, or erratic behavior while typing or drafting email messages

Resolution

Because this is a broader service-level issue being handled directly by Microsoft, local troubleshooting steps (such as reinstalling Outlook or re-entering credentials) will not permanently resolve the login loops or errors.

Official Recommendation:

Campus IT strongly advises all users to avoid using New Outlook and instead switch to Outlook Classic or Outlook on the Web (https://outlook.office.com)


Keywords:
Outlook access denied, New Outlook error, Try the new Outlook issue, Outlook permission error, Microsoft Outlook bug, cannot open Outlook, access denied email, Outlook classic vs new, Access Denied 
Doc ID:
164834
Owned by:
Madisen L. in College of Applied Health Sciences
Created:
2026-10-14
Updated:
2026-10-19
Sites:
University of Illinois College of Applied Health Sciences