Permissions
Every module in Microbizz has a set of permissions, which is the case for the Calendar module as well.
For a general understanding of permissions visit this section. The screenshot below may not be up to date.

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iCal-link: This controls access to the ICAL LINK menu
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Appointment types: ALlows access to editing of appointment types
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Resources - overview: Allows access to the overview of resources
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Resources - Edit: Allows access to editing resources
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Filters: Who has access to configuring filters
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Fields: Who has access to custom fields setup