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Calendar data sources
Here you can find detailed information about calendars and data sources that you can overlay in Virto Calendar Overlay for SharePoint.
With Virto Calendar Overlay, you can overlay various calendars in a single calendar view. Let’s see which calendars you can use as data sources.
You can create an unlimited number of calendars with multiple data sources.
With Virto Calendar Overlay, you can combine any number of Exchange Online shared and personal calendars in a single calendar. This is the fastest way to create a calendar overlay because no special fine-tuning is required for this data source.
This is one of the most popular options to overlay calendars. Use SharePoint lists (including lists in a calendar view) as data sources for your overlay. You can overlay an unlimited number of lists in a single view.
An iCalendar feed or .ics feed is a unique calendar format you can use to work with most calendar solutions. Generate iCal links and overlay events from Google Calendar or any other external calendar that supports iCalendar feeds.