Change Office 365 portal language for synced users

Users cannot change the display language of the Office 365 portal themselves if they are synced users, and they’ll receive an error. If you attempt to do this as an administrator using a Powershell command to set the PreferredLanguage attribute directly like this:

set-msoluser -userprincipalname "xxx" -PreferredLanguage "en-US"

You will see this error:

set-msoluser : Unable to update parameter. Parameter name: PreferredLanguage.
At line:1 char:1
+ set-msoluser -userprincipalname xxx -preferredlanguage "en-US"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : OperationStopped: (:) [Set-MsolUser], MicrosoftOnlineException
+ FullyQualifiedErrorId : Microsoft.Online.Administration.Automation.PropertyNotSettableException,Microsoft.Online.Administration.Automation.SetUser

You can only set the PreferredLanguage attribute on non-synced users because this property is managed by dirsync/aadsync, and thus only settable on your onpremises Active Directory. Use ADSIEdit or Powershell to change the PreferredLanguage property locally for your users and then run a sync to change the language in Office 365.

Here’s an example PS snippetĀ that will set (bulk change) the preferredLanguage Active Directory atrribute of all your users to Dutch:

Get-AdUser -Filter * -ResultSetSize 9999 | Set-ADUser -Replace @{‘preferredLanguage’=”nl-NL”}

If you need to look up your own language code, you can do so here

Note: if the PreferredLanguage attribute is not set, language will default to English.

ADFS v2 to v3 side by side migration for Office 365

Some time ago we built a second ADFS farm at our datacenter. We knew we had to upgrade to v3 at some point, but wanted to keep our v2 farm intact so we could always do a rollback. We also wanted to use a new domain name for our brand new Windows 2012 R2 ADFS cluster, including the WAP proxies.

Setting all this up proved fairly easy, ADFS v3 was Continue reading ADFS v2 to v3 side by side migration for Office 365

Microsoft 365, Azure, Automation & Code