Changing EXCHANGE alias - what impact?

Migrating to exchange 2013 and Office 365 from Exchange 2010 - ran IDFix tool  that has a list of illegal characters and duplicates for the Alias addresses identified by IDFix for Distribution Lists.

What is the impact of changing just the Alias or mailNickname attribute?  This also changes the SMTP but DL still shows up in the GAL.  Would this only impact any external SMTP addresses anyone would have, or locally cached data?  

Thanks!
Rob ShortsAsked:
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AmitIT ArchitectCommented:
If you have set any custom address, then only you will face any issue. Rest it will work as usual.
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