Outlook on premise Exchange web add-ins stopped loading after updating to Version 2603

• Copilot buttons are missing in classic Outlook for WindowsInvestigating · Classic Outlook known issues
• Public Holiday Calendars Missing Dates After June 2026 in OutlookWorkaround · Classic Outlook known issues
• Classic Outlook for Windows might crash when accepting a Shared Calendar inviteInvestigating · Classic Outlook known issues
• In AutoComplete, the "X" to remove individual suggested recipients might not work as expectedInvestigating · Classic Outlook known issues
• Outlook crashes unexpectedly when using Kaspersky antivirusInvestigating · Classic Outlook known issues
• Users may get the error "Can't connect to the server" when creating groups in classic OutlookInvestigating · Classic Outlook known issues

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