tool to convert 2003 distribution list to 2007 universial distribution lists

We just installed Exchange 2007 - in looking at our Recipient configuration\Distribution groups we see multiple entries of "Mail Non-Universial group" and "Mail-enabled-universial distribution group"  - is there a best practtice that shouild be used to convert these - Is it best to do it through AD  or through then EMC?
What will happen to my 2003 Exchange servers when these get converted -  Is there any delay or latency?
SynarcAsked:
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SysExpertCommented:
Have you read the Exchange 2007 Admin guide.

It has info on this.


I hope this helps !
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SynarcAuthor Commented:
Sorry - did not see on listed anywhere - I even "googled:" it.
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