Why isn't the Voicemail indicator light working on my user's VoIP phones?

I am not sure if it is related but we recently separated our Exchange store into four smaller stores in Exchange Enterprise.  I am now having an issue with the voicemail indicator lights not working specifically for the users whose mailboxes were migrated between stores.  When a voicemail is left for one of the affected users they get the email notification from Unity as well as the prompt on the phone itself except for the indicator light.  They are able to retrieve their messages normally without any problems.

I have looked in CCM (Cisco Unified CM Administration) and have verified that the user’s, “Visual Message Waiting Indicator Policy” is set to use the system default, as are all my users.  I have also manually changed it to, "light and prompt" but that doesn't have any affect.

Any ideas what would be causing just the indicator lights not to be working and/or how I can view the system policy to verify it?

Exchange and Unity are both running on Server 2003 Standard SP2 boxes.
Exchange Enterprise V6.5.7638
CCM V7.1.5.1000
Most of the phones are 7940s with a few 7941s and 7960s thrown in.
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nhawkinsVAAuthor Commented:
Thanks, I needed to resynch Unity.
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