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Zimbra Holidays Calendar

Calendar Sources

https://www.officeholidays.com/subscribe/usa

Sample US Federal Holidays iCal URL: 

https://www.officeholidays.com/ics-fed/usa

Add External Calendar

Adding an external iCal calendar to your Zimbra Web Client (ZWC) only takes a minute!

ZWC → Calendar → Gear Icon → Add External Calendar → iCal → Add URL