Active Directory Custom Attribute for personal e-mail?

I'm looking to create a new Custom Attribute in my Active Directory schema to add for Users.
Which setting is best to support one that will hold personal e-mail addresses?
For example one User may have "bob@yahoo.com", but someone else may have two e-mails like "sally@gmail.com" and "sally@live.com".
This would be an indexed attribute for future searching/querying.

My AD functional level is Windows 2008 R2. Do not want to use any MS Exchange schema.
garryshapeAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Henrik JohanssonSystems engineerCommented:
If you have extended Schema by installing Exchange, you have 15 ExtensionAttribue(1..15) that can be used. If using Exchange tools, the attributes are labeled CustomAttribute (1..15)

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
garryshapeAuthor Commented:
My only concern with those is we'd lose the attributes if the mailbox were ever to become disabled. We'd want them more just as a user/person schema only and not relying on Exchange schema.
garryshapeAuthor Commented:
I think I will just create "otherAddresses" attribute and make it Unicode String multi-valued, indexable.
garryshapeAuthor Commented:
Needed for user without other schema affecting
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Active Directory

From novice to tech pro — start learning today.