Office 365 Set language and time zone for all users with PowerShell (Manual)

When you create a new Office 365 tenant, all user mailboxes will have the default timezone and language. In my case, I work in the Netherlands, the preference for most companies is to set the Time zone to Central European Time (GMT +1) and the language of the users default folders to Dutch.

You can either ask the users to logon to webmail using https://outlook.office.com and fill in the first time question to set the time zone and default language. But how cool would it be to do this for all your users using PowerShell?

First time login screen Outlook Web Access
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