Change msRTCSIP-GroupingID for multiple users

If you want In your organization to separate several Organizations from seeing each other.

You must set OU GUID  to msRTCSIP-GroupingID attribute.

After getting the OU ObjectGUID we set this GUID as the msRTCSIP-GroupingID option for all users in that OU.

to do this using powershell for multiple users:

copy OU ObjectGUID.

for example: 2DCF9FC8-CB7C-4382-AA97-EF9B890B9B6A

copy this GUID and convert this GUID to Hexadecimal

use this site:

http://www.windowstricks.in/online-windows-guid-converter

after converting we'll have C89FCF2D7CCB8243AA97EF9B890B9B6A

change this format to xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

C89FCF2D-7CCB-8243-AA97-EF9B890B9B6A

first import the AD PowerShell Module:

Import-Module ActiveDirectory

$Users = Get-Content c:\tmp\atribute.txt

ForEach ($User in $Users) {

Set-ADUser -Server test.local -Identity "$user" -replace @{'msRTCSIP-GroupingID'=[GUID]("C89FCF2D-7CCB-8243-AA97-EF9B890B9B6A")}

}