Adding an Enterprise CA to the mix

I am adding an enterprise CA to my active directory environment.  At present, the only things in my network that are at all affected by certs are the mobile devices (all iPhones) which connect to our Exchange 2003 server via active sync over VPN.  The is currently no outside SSL and we do not use OWA.  
I know that there is a cert assigned by default to the IIS ActiveSync page on the exchange server.  Will adding an enterprise CA affect that cert in anyway?  I have messed with that cert in the past and knocked email on the phones, so I don't want that to happen again.
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After adding the enterprize CA you can still use the other certificate.

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lgeccuexAuthor Commented:
Does ActiveSync simply continue using the cert it's got?
Yes you assign the certificate which you are using currently to activesync.
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