Ranamed exchange 2007 mailbox still shows old name in the From field

Using Exchange 2007 we have a mailbox that was named 'Engineering' with an email address of 'techsupport@domain.com'. They didn't want to see 'Engineering' in the 'To' field but rather 'Tech Support'. So I renamed mailbox to 'Tech Support' and sent a test email from my gmail account and all was fixed. But when I replied to that email in Outlook it said it was From 'Engineering'. If I double clicked on Engineering the email and display name all say 'Tech Support'. If I went ahead and sent the reply email to my gmail account, the 'From' would display 'Tech Support'. Just can't figure out how to change the FROM field when users here hit the reply button in Outlook. There's only 2 users that have access to that standalone mailbox. I've run adsiedit.msc and have found no traces of 'Engineering' anywhere. I've updated the offline address book. Is this cached somewhere that I'm missing?
Thanks alot
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B HCommented:
if people have a local contact in their own outlook, it will resolve to that name for the display name

in the exchange management console, properties of that box, did you change it appropriately in these places:

general > name
user information > name
user information > simple display name
bwinkworthAuthor Commented:
Hey Byron,
 For testing purposes I have been using my outlook account. My local contacts do not contain an Engineering contact that it may have been resolving too. I also checked your suggestions and all names/display names have Tech Support in there.
Thanks man,
Khurram Ullah KhanCommented:
It is your local outlook cache problem do following and check
1. Type command  “%APPDATA%\Microsoft\Outlook ” in run and press OK.
2. You will see a Outlook.NK2 file. Delete it.
3. Download full address book again.

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bwinkworthAuthor Commented:
That'll do it. Thanks all
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