Upgrading Network from Norton 10.5 Enterprise

I'm upgrading from Norton 10.5 Enterprise to Trend Micro Neat Suite Advanced.  I sit in a microsoft shop, 75 user domain and just want to know what the transition is going to be like.  Exchange 2007 mail server.

One hiccup in all of this... Our server running Norton AV crashed last week and so all the centralized information on the clients is lost.  So I am going to need to uninstall Norton from all the client machines.  Is this uninstall going to be perfectly clean?  Any residue left that may later give me issues with Trend Micro?

Any tips for a smooth migration for me?
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I would download a tool called NoNav this will delete all registry entries as well as get rid of the program. It should make your transition flawless.

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