Webmail login after primary SMTP email address change

We changed our company name, but not our company internal domain.
How can I change webmail login to match new users primary SMTP address, as i only works with the old login @internaldomainname.

Example: our internal domain name is aaa.com
We changed our name to bbb.com and added bbb.com as an accepted domain in exchange server, and set all users primary smtp addresses to use @bbb.com.

However to access webmail, users still need to use @aaa.com.
Can we change webmail to accept @bbb.com as a users login address?

thanks.
keamalsaSystem AdministratorAsked:
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Nick RhodeIT DirectorCommented:
You could just setup login via username:

http://exchangeshare.wordpress.com/2008/06/30/owa-login-without-domain-name/

Otherwise in your case its because the address does not match the UPN (they have to be the same).

http://social.technet.microsoft.com/Forums/exchange/en-US/cec198f0-d2c2-4c97-ba65-c4638379b1dd/owa-login-with-email-address
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