Managed Unit Disabled Accounts

Hi Guys. 

I have a need to have a Managed Unit which just shows me disabled accounts. 

I cant see edsaAccountIsDisabled attribute when i build the query on the MU. Using the below LDAP query works for some accounts but not all

 (&(sAMAccountType=805306368)(userAccountControl:1.2.840.113556.1.4.803:=2))

Any ideas why or is there a better way to get a MU with just disabled accounts? 

Cheers

Craig