Assistance with Powershell custom attribute population

Question

I'm currently undertaking an exchange 2003 to exchange 2010 migration and as part of this am having to redesign the email address policies. Our legacy recipient policies have worked well by targeting exchange alias but in 2010 this won't work.
We have a number of exchange domains and in order to update the email addresses for a group of users we have decided to use custom attribute 15 to target these AD groups, however updating this manually for over 2000 users would prove very time consuming.
Exchange 2010 seems to be geared towards powershell and as it's still early days in my knowledge am looking for assistance.
Does anyone know a powershell command I can run to update custom attribute 15 for users of a specific security group?
Many Thanks

Answer 1

I am no exchange expert but also not sure what you mean by custom attribute 15. Since you want to update "users" in a specific "group" I assume this will be in Active Directory?
If so, you can use the AD cmdlets to get the job done. On a machine that has AD users and computers installed you can do something like this:
Import-Module ActiveDirectory
Get-ADGroupMember -Identity groupName | ForEach-Object{
Set-ADUser -Identity $_ -Replace @{customeAttributeName = "Replacement"}
This hasn't been tested as I do not have an environment to test in, and not sure on the custom attribute name or what needs to be replaced with, so you will need to replace groupName with the group in question, customAttributeName with the correct name and
"Replacement" with what you are replacing.
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