Can't open a calendar from a sharing invitation in Outlook on the web

Original KB number:   3187214


A user can't open a calendar from a sharing invitation in Outlook on the web because the Accept button is missing. Additionally, an .eml file is attached to the sharing invitation.


This issue occurs if a disclaimer transport rule is applied to calendaring messages, and Wrap is specified as the fallback action.

Screenshot of the disclaimer transport rule showing the fallback action set to Wrap.


To resolve this issue, use one of the following methods:

  • Change the fallback action of the disclaimer transport rule from Wrap to Ignore.

  • Change the disclaimer transport rule to skip calendaring sharing invitations. For example, add an exception that specifies the following conditions:

    Except if: The subject or body > subject or body includes any of these words > has invited you to view their Microsoft Exchange Calendar or Sharing invitation or Sharing request or I'd like to share my calendar with you or You're invited to share this calendar

    Screenshot of the exception that's added to the disclaimer transport rule.

For more information about how to set up disclaimers, see Organization-wide disclaimers, signatures, footers, or headers in Exchange Server.

More information

For more information about transport rules in Exchange Online, see Mail flow rules (transport rules) in Exchange Online.

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