UseSimpleDisplayName attribute

Hi,

i want one of my users to change from field in messages, but do not modify AD settings.

here are 3 commands i used

set-user testUser -SimpleDisplayName "Test"
Set-Mailbox testUser -SimpleDisplayName "true"
Get-remotedomain | set-remotedomain -UseSimpleDisplayName $true

my remote domain is 

Name                           DomainName                                        AllowedOOFType
----                           ----------                                        --------------
Default                        *                                                 External

but i havent noticed that these 3 commands changed anything.