Nov 22, 2019 · Create the address list before you create the users – then all new created users will show up, if they match the filter criteria. Update existing user’s attributes by re-setting a property in the mailbox (or in the user properties, if it’s f.e. a contact). So with this said, if you have an existing Address list and create a new user that matches that address lists filter criterias, it should populate. 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 But how cool would it be to do this for all your users using PowerShell?