You can find the feature in the following location: Overlay Mode is the feature where you can actually place these Calendar “on top of each other” to create a aggregated view which looks like a single Calendar. Side-by-Side Calendars is the feature which lets you select multiple Calendars when you are in the Calendar Navigation (CTRL+2) simply by clicking the checkbox in front of the Calendar. Overlay Mode was first introduced in Outlook 2007 after Outlook 2003 introduced Side-by-Side Calendars. In the Calendar, “Overlay Mode” is such a hidden gem by which you can solve the above issue with ease. Usually, there is a much better way to do this but often the option to do so isn’t easily discoverable or you might not have been aware that Outlook could do it in the first place. When I hear people talking about duplicating data within their own Outlook configuration, I always cringe a bit. Is there any way to automate this process or a better way to create a single merged Calendar?
Obviously, this is quite error prone and cumbersome.
To maintain my overview, I currently copy their content to a separate combined calendar. Some of them are shared Calendars from managers and colleagues. I have access to multiple Calendars in Outlook.
