Outlook.com calendar csv export with custom field (private office 365)

Hey Folks
Looking for a Script to export multiple calendars from specific outlook account (running several accounts in local outlook 365 single/private version.
The Calendars are hosted on a outlook.com account.
I need a csv or excel as export.
I d like to configure a windows task to automate the script without outlook running.
Think PowerShell is the way to go (or are there other approaches?)
Tried several scripts found in the net, but was not successful until now. Any help highly appreciated.

This forum is for scripting questions rather than script requests. We do not write customized and ready to use scripts or solutions on request.

We actually expect you to make an own attempt at the first place to get your task done or to solve your problem. If you have done so already please document here what exactly you have done and show your code. Then we probably might be able to help you step further.