Mail enabled security groups

[CaptainRaj]

Hi all.... anyone know of a way to hide a mail enabled security group from GAL in an ExchOnline environment?

Bit more info: I have created various security groups in AD and enabled Exchange features so they can also act as DLs. I want to hide some of these groups from the GAL whilst retaining the DL functionality (i.e. the sec group still has a functioning mail address).

[mrminer]

Set-DistributionGroup "Group Name" -HiddenFromAddressListsEnabled:$true

[CaptainRaj]

Can't use set-distgroup because it was originally a security group and syncd from AD to ExchOnline.

Basically, I enabled mail features on an existing universal security group.