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

- Open Outlook and click the calendar icon in the left hand panel
- Scroll down and right click on 'Shared Calendars'
- Click add calendar, then click 'Open Shared Calendar...' (this will open a dialog box)
- Input the email address of the staff member who has shared their calendar with you (abc@leeds.ac.uk as an example) and click ok. This will add their calendar as an option for you to toggle under the 'shared calendars' dropdown.
Adding a shared calendar in Office on the Web
- Log into Office365 using this link, office365.leeds.ac.uk. Access Outlook by clicking the Outlook icon once logged in.
- Click on the calendar icon on the left hand sidebar and then click 'add calendar'

- Go to 'add from directory' and then under the 'please select an account to search from' dropdown select your own account.
- Enter the email address or name of the person who has given you permission to access their calendar.
- Choose a calendar group you would like to add it to.
- Click 'add' and you will be able to access it from the calendar group dropdown in your calendar list from now on.