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Outlook Calendar Meetings are send in Plain Text

Melanie Huß | CCX Solutions GmbH 0 Reputation points
2025-12-04T10:06:50.3233333+00:00

Hello everybody,

I'm using Windows 11 25H2 (fresh installation) with Office 2024.

When I'm sending Meeting invitations my customer get's that invitation like this:

BEGIN:VCALENDAR PRODID:-//Microsoft Corporation//Outlook 16.0 MIMEDIR//EN VERSION:2.0 METHOD:REQUEST X-MS-OLK-FORCEINSPECTOROPEN:TRUE BEGIN:VEVENT ATTENDEE;CN=[Receipient];RSVP=TRUE:mailto:[Receipient] CLASS:PUBLIC CREATED:20251120T193751Z DESCRIPTION:\n DTEND;VALUE=DATE:20251126 DTSTAMP:20251120T193751Z DTSTART;VALUE=DATE:20251125 LAST-MODIFIED:20251120T193751Z ORGANIZER;CN="[DisplayName]":mailto:[Sender] PRIORITY:5 SEQUENCE:0 SUMMARY;LANGUAGE=de:test01 TRANSP:OPAQUE UID:040000008200E00074C5B7101A82E00800000000E0D8F67D5D5ADC01000000000000000 010000000E738D010B424AA43AE74F0049AA46448 X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE X-MICROSOFT-CDO-IMPORTANCE:1 X-MICROSOFT-CDO-INTENDEDSTATUS:FREE X-MICROSOFT-DISALLOW-COUNTER:FALSE X-MS-OLK-AUTOSTARTCHECK:FALSE X-MS-OLK-CONFTYPE:0 BEGIN:VALARM TRIGGER:-PT1080M ACTION:DISPLAY DESCRIPTION:Reminder END:VALARM END:VEVENT END:VCALENDAR

I tried to uninstall Office 2024 and install Office again.

I tried to delete my userprofile and Outlook Profile.

Nothing helps.

I connect my Outlook via ActiveSync to my provider. With other Mailclients everything works fine - just Outlook does not work.

I do not create Teams Meetings - it happens with every meeting invitation I send from my Mail Client.

Any help would be appreciated.

Regards

Melanie

Outlook | Windows | Classic Outlook for Windows | For business
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  1. Jayden-P 12,230 Reputation points Microsoft External Staff Moderator
    2025-12-04T12:11:27.39+00:00

    Hi @Melanie Huß | CCX Solutions GmbH

    Thank you for posting your question in the Microsoft Q&A forum.

    May I ask are you using Microsoft Exchange Server as your provider or are you using from a third-party provider?

    If you are using Microsoft, choose Microsoft 365 so Outlook connects using Modern Authentication and the supported Exchange protocols (MAPI/HTTP). Using EAS for an Exchange mailbox will break full calendar/contact features and integrations like meeting invitations (the issue that you are seeing).

    If you are using another provider, use IMAP/POP this for providers that publish IMAP/SMTP with OAuth2/Modern Auth. It normally will sync email-only, calendar/contacts are limited unless the provider supports those. Sync basics - what you can and cannot sync - Microsoft Support

    EAS is designed for mobile sync (mail, calendar, contacts) and is not a replacement for full Exchange connectivity on desktop. So, it might break the meeting invitations. Exchange ActiveSync | Microsoft Learn

    Please try and let me know if it works for you.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".   

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