Upgrading distribution lists created in Ex2003 - any side-effects or problems elsewhere?

Hello,
We migrated from Ex2003 to Ex2010 a couple of years ago. 
I'm trying to change the name of a few old distribution lists in the EMC and I'm being prompted to "upgrade" them and warned that it's a one-way conversion.
I know this is needed and I know that it's necessary. My question is if the conversion will ONLY affect the lists, or if it will affect the members or some other part of the Exchange organisation in some way? I also read that it prevents anonymous users
(ie, Internet users) from mailing the upgraded lists by default.
Exchange 2010 latest service pack with Outlook 2010 clients. Single forest/domain. DAG-based implementation in two AD-sites.
Thanks,
- Alan.

Hi Alan,
From your description, I would like to clarify the following thing:
Upgrading the Exchange version of an object is a one-way-street. After you upgrade the Exchange version of this distribution group, it cannot be managed or downgraded to the Exchange 2003 level with the Exchange admin tools anymore. A user with an Exchange
2003 mailbox cannot modify the distribution group membership of an Exchange 2010 version distribution group.
For more information, here is a blog for your reference.
Distribution Group Management Across Exchange Server Versions
http://blogs.technet.com/b/mspfe/archive/2013/12/05/distribution-group-management-across-exchange-server-versions.aspx
Hope this can be helpful to you.
Best regards,
Amy Wang
TechNet Community Support

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