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 "", but someone else may have two e-mails like "" and "".
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.
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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)

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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
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