Hi @Carl-Erik Kopseng ,
For documentation on Exchange management, you can refer to the following two links. You can find the basics and operations of Exchange through the table of contents and search box on the left:
Exchange online:
Exchange Online | Microsoft Learn
Exchange server 2016:
Exchange Server post-installation tasks | Microsoft Learn
If you need guidance on calendars and EWS, you could take a look at this documentation:
Calendars and EWS in Exchange | Microsoft Learn
Hope the above is helpful to you!
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