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Don't you have to "add new calendar" every time, or a change in the Calendar will change old schedules?

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John Reeves
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Don't you have to "add new calendar" every time, or a change in the Calendar will change old schedules? - if not, why not?

Santosh Bhat
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If you overwrite an existing calendar in a P6 database, yes all projects that use that calendar may be affected. I say "may" as this will only happen once those projects are opened and then re-calculated.