We have several companies under our parent, each requiring separate GAL's in addition to the Default Global Address List. I have been able to create the additional GAL's via Exchange Management Shell using the syntax New-GlobalAddressList -Name "Brian Harris BMW Mini" -ConditionalCompany "Brian Harris BMW Mini" -ConditionalCustomAttribute15 "DistGroupBMWMini" -IncludedRecipients "AllRecipients". This syntax correctly created the Custom GAL, however we have had to make a change and only want to filter by the -ConditionalCustomAttribute15 value. I have used then following to attempt to modify the GAL Set-GlobalAddressList -Identity "Brian Harris BMW Mini" -ConditionalCustomAttribute15 "DistGroupBMWMini". Upon execution of the script I receive no errors, and the script completes and returns to the PowerShell Prompt. I then update the GAL with Update-GlobalAddressList command, and then use the Get-GlobalAddressList -Identity "Brian Harris BMW Mini" | FL to return the results. Long story short the -ConditionalCompany parameter is not being removed. HELP!!! Any ideas and suggestions are welcome.

Gunny, You need to set the ConditionalCompany attributes value to NULL. Run this command and then run the update-globaladdresslist cmdlet. Set-GlobalAddressList -Identity "Brian Harris BMW Mini" -ConditionalCompany $NULL -ConditionalCustomAttribute15 "DistGroupBMWMini" Exchange & Powershell Geek MCITP: Enterprise Messaging Administrator MCITP: Enterprise Messaging Administrator 2010 Click Here to see my transcript

Aaron Thank you for your assistance and your advice, using the syntax you provided I was able to correct the address list issue. Semper Fi Stephen