Configure correct language / date / timezone Office365 powershell

Before connection check necesaury software.

Install-Module -Name ExchangeOnline

Then connect to Azure with the Office365 (worldwide) global admin credentials:


After connecting, check the current setting for the tenant. Warning, thisd command shows all mailboxes:

Get-Mailbox | Get-MailboxRegionalConfiguration

To change a single mailbox use:

Set-MailboxRegionalConfiguration -LocalizeDefaultFolderName:$true -Language nl-NL TimeZone "W. Europe Standard Time"

To change all the mailboxes (including shared) at once use this command:

Get-Mailbox Resultsize unlimited | Set-MailboxRegionalConfiguration -LocalizeDefaultFolderName:$true Language nl-NL TimeZone "W. Europe Standard Time"

Re-run the first command to check if changes are passed.

Common used (for us) timezones:

W. Europe Standard Time (GMT+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna

Common used (for us) language:

nl-NL Dutch – The Netherlands
en-GB English – United Kingdom
en-US English – United States
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