If statement not finding the right info

Hi there

im trying to find if a value matches on a certain attribute in Ad and exchange(an attribute that an address list is based on)

so when i try this:

(Get-ADuser user1 -Properties showInAddressBook).showinaddressbook

i get this:

CN=department1,CN=ORG,CN=All Address Lists,CN=Address Lists Container,CN=ORG,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=ORG,DC=COM

CN=ORG,CN=All Address Lists,CN=Address Lists Container,CN=ORG,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=ORG,DC=COM

CN=Default Global Address List,CN=All Global Address Lists,CN=Address Lists Container,CN=ORG,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=ORG,DC=COM

CN=All Users,CN=All Address Lists,CN=Address Lists Container,CN=ORG,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=ORG,DC=COM

then i try this:

if ((Get-ADuser user1 -Properties showInAddressBook).showinaddressbook -contains "department1") {Write-Host " IN department1"}

but the result comes out opposite to the query

-contains return nothing while -notcontains returns true:)

i tried using other things but it doesnt seem to work for some reason ,not sure why

any ideas?

thanks in advance