User Account Name Change

I changed the name of a user account used for a program I developed from RTSQLCMD to RTScheduler.  In the ADUC (dsa.msc), I changed the "User Logon Name," the "Display Name," and I right clicked on the account and changed the name using the "Rename" option.  At this point, I assumed all was well.  Then I hopped into SQL Server and attempted to add <DomainName>\RTScheduler as a SQL Login.  I was told the account doesn't exist.  So I tried RTSQLCMD, and the account was located.  I don't get it.  I went to all that effort to change the account name and the old name was still buried in the AD.  Can someone explain to me what's going on and what my options are?  Is deleting the original account and starting from scratch my only good option?
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Did you allow time for replication to occur - can take upto 15 minutes, sometimes a bit longer.
jdanaAuthor Commented:
Good question.  Unfortunately I did.  Take a look at the following screen shots.  SS1 represents the Select User or Group dialog after I located the user account with the new name (RealTimeScheduler).  I click OK, and the user names morphs back to the old name (RealTimeSQLCMD).
there  are  two namea for the  account, CNAME and  mail alias.  Ensure that both  names  are remove  right clicked the user account click edit and ensure the  name is changed and also  go ensure the email is  removed or  renamed  from that  account  account

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* As suggested above, correct the Alias in the Exchange General tab of the users AD account.
* Else, change it from ADSIEdit tool.

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