If you find that your organization is not using a specific calendar in Project, delete it!
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Click File > Info > Organizer.
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Click the Calendars tab.
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Choose the calendar you want to delete, and then Click Delete.
What else can I do with calendars?
Project enables you to fine-tune scheduling using multiple calendars. If you understand how they all work together, it's easier to plan for how your project's dates will be impacted. Here are a few more articles you might find helpful in building a more accurate picture of the working and nonworking days in your organization.
PROJECTS Set the general working days and times for a project Create a new base calendar Add a holiday to the project calendar
TASKS Add a calendar to a task
RESOURCES Set a unique schedule for a specific resource Add a resource's vacation time Change resource availability without using a calendar
