Exchange Attribute msExchShadowProxyAddresses.

Does anyone know what this Exchange AD User Attribute (msExchShadowProxyAddresses. )is used for and if there is any harm in deleting the Proxy information in the pane? Exchange Attribute msExchShadowProxyAddresses
sergio vegasystems administratorAsked:
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Justin YeungSenior Systems EngineerCommented:
msExchShadowProxyAddresses attribute should be storing the alias email address of the user.

so deleting the content will remove the aliases from the users.
sergio vegasystems administratorAuthor Commented:
Hi Justin, thanks for your quick response.  To my Knowledge the primary attribute that truly stores the Alias email address for Exchange and Office 365 is the other AD attribute proxyAddress.  I know for a fact that making changes to this attribute can have an impact on the user(s) mail account.  

I don't disagree with you that making changes in the msExchShadowProxyAddresses attribute might have a negative impact also, but in our environment, these do not match what's in the other proxyAddress attributes, in some cases the msExchShadowProxyAddresses is empty for the user.  

I am curious to know what msExchShadowProxyAddresses attribute really does and is used for?  I am having a hard time finding any legitimate information online.  

Kind Regards,
Justin YeungSenior Systems EngineerCommented:
I am not 100% sure, but I believe that is for other services such as Lync to read the proxy addresses.

as you see the attribute name is "shadow", so it is probably a copy of the proxyaddress attribute for other services other than exchange itself.

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sergio vegasystems administratorAuthor Commented:
The answer is acceptable, although no sort of Microsoft KB article was provided.  Thanks
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