Konecne jsem nalezl reseni na EN foru, ktere funguje i pro Outlook 2003. Drive (Exchange 2003) to byl ve vlastnostech objektu, zalozka Exchange Features "HideroupMemebersip" (nevim, jestli se to jmenovalo presne takhle). Jinak to nastavite takhle.
1.
Open ADUC from RSAT or Windows 2008
2.
Drill down to the object level
3.
Find the DL which needs to have the membership hidden
4.
Right Click, properties
5.
Click on the Attribute Editor Tab
6.
Drill down to the
hideDLMembership value
7.
Edit property to show TRUE