I've seen quite a few forum questions about creating a vacation/absence calendar in Office 365, but none of the answers satify me. In our case, payroll updates the number of vacation days each employee has once a year. Employees should be able to see their vacation balance when booking vacation time. Since all employees are required to add all absences to their Outlook calendar, it would be ideal if we could have a custom event type for vacation and when adding a vacation event type Outlook would look up your vacation balance (from wherever it's stored, e.g. SharePoint list). We do not need a request/approval process. I started looking at creating an Outlook add-in as I have some experience in that, but it's no longer COM/VSTO but Javascript.
I would appreciate any pointers to how I could achieve this functionality in Outlook calendar.
