Both will work.  What you get with a third party cert is the assertion that
the server to which your clients are connecting is truly part of your domain
(i.e. traffic isn't being hijacked to a rogue server in order to steal
passwords, etc.)

With a cert from a homegrown server, your users will always get a message
when they connect to your OWA server that the cert cannot be verified.  The
server is effectively saying "give me your password, please.  You can trust
me because I say I can be trusted.  Here's proof that I generated that says I
can be trusted."  Users can be trained to ignore the cert error.  

In my opinion it's not as clean of an implementation and the $700 for a third
party cert is justified.


*********************************
* Erik Sojka, MOS, MCSE         *
* Asst. VP, Technology Services *
* [EMAIL PROTECTED]               *
********************************* 

> 
> -----Original Message-----
> From: Scott Force [mailto:[EMAIL PROTECTED] 
> Sent: Friday, June 13, 2003 10:32 AM
> To: Exchange Discussions
> 
> I've setup OWA (5.5/6a) and I now want to secure it with SSL. 
>  I have a
> stand alone 2000 server where IIS and OWA are installed in an NT 4.0
> domain.  Do I have to install Certificate Services on the 
> 2000 server or
> can I use one from a third party (ie VeriSign) vendor?
> 
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