Share calendar invitation email blocked by Trend

 This article will explain and provide a work around for the known issue of sharing calendar invites being blocked by our third-party security solution (Trend). 

Attempting to add a member of staff to the permissions on any of your calendars will result in an email being sent to that member of staff notifying them that they now have access to the calendar. However this invite includes an .xml file type attachment which is classified as a security risk. Because of this you will receive an email from our security system that looks something like the example below. The calendar invite you sent will be removed from the recipient's mailbox. 

Both the recipient and the sender will receive this. The sender receives this because a copy of the email is put into their 'sent items' and then blocked. 

Despite the email being blocked, the person who has been designated permissions on the calendar can still access it using either of the methods below. 

Adding a shared calendar in the Outlook application


Adding a shared calendar in Office on the Web