That's one way, but it could be circumvented.

You can just disable those features on the mailbox of folks you don't want
connecting:  http://technet.microsoft.com/en-us/library/bb125264.aspx

And you can maintain the ABQ list for devices that can/can't connect:
http://blogs.technet.com/b/exchange/archive/2010/11/15/3411539.aspx


 - Will


On Thu, Jul 5, 2012 at 8:17 AM, <[email protected]> wrote:

>  Thanks for the great comments.  I’ll revisit the design with the vendor
> helping me implement the solution.  It seems clear that I should be using a
> commercial cert for the edge services - access.xyz.com, webcon.xyz.com,
> av.xyz.com.****
>
> ** **
>
> In addition to the needs for my Lync installation, I had originally
> intended to use an internal CA to issue certs to company laptops and cell
> phones in the case where management chooses to want to limit access to
> outlook anywhere and activesync to only company issued devices.  Does that
> sound reasonable or is there a better way to limit access to such things to
> company issued devices should that be their whim? ****
>
> ** **
>
> Jim ****
>
> ** **
>
> *From:* William Robbins [mailto:[email protected]]
> *Sent:* Wednesday, July 04, 2012 9:21 AM
>
> *To:* NT System Admin Issues
> *Subject:* Re: Certificate authority****
>
> ** **
>
> I'd have to concur, especially if federating is in your Lync future.
>
> Besides that if you are utilizing smart phones/3rd party software it's *
> much* easier to use certs from an already trusted external CA.  Otherwise
> you'll need to install Root CA chains on your devices for your internal CA.
>
> We ended up using a hybrid of internal and external certs, but our
> internal PKI is mature, and we used 3rd party certs for all the Edge's.
>
>  - Will
>
> ****
>
> On Wed, Jul 4, 2012 at 11:04 AM, Brian Desmond <[email protected]>
> wrote:****
>
> *Why does installing Lync necessitate a CA? Just get the certs from a
> commercial CA. *****
>
> * *****
>
> *Thanks,*****
>
> *Brian Desmond*****
>
> *[email protected]*****
>
> * *****
>
> *w – 312.625.1438 | c   – 312.731.3132*****
>
> * *****
>
> *From:* [email protected] [mailto:[email protected]]
> *Sent:* Tuesday, July 03, 2012 5:49 PM****
>
>
> *To:* NT System Admin Issues****
>
> *Subject:* Certificate authority****
>
>  ****
>
> We will be installing Microsoft Lync here very soon and I need to have a
> certificate authority running.  To date, we’ve not had a need to stand one
> up and from the research I’ve done, it seems there are a number of ways to
> go – three tier, two, standalone.****
>
>  ****
>
> Our needs are for Lync, maybe some certs for some smart phones and some
> internal software we’ve written so it’s not a complicated system from our
> perspective.  At least not for the short term.  I obviously don’t want to
> do something that I’ll regret later and was looking for some advice from
> other who have traveled these roads and learned what to do, and what not to
> do.****
>
>  ****
>
> From my research, I think a two tier system will work but I’m not real
> clear at this point how you have an offline CA (for security purposes) and
> subordinate CA’s to hand our certs.  Still reading up on all that.****
>
>  ****
>
> Am I overthinking all this as my Lync installer suggests?  He said that I
> should just install the certificate role on a DC and that would be that.  I
> think they might be better at installing and configuring Lync than they are
> at designing certificate authorities as my research indicates doing that is
> not the best way to go.****
>
>  ****
>
> Can anyone share their experiences as time is short and I need to decide
> what CA to stand up.****
>
>  ****
>
> Any advice would be appreciated.****
>
>  ****
>
> Thanks****
>
>  ****
>
> Jim****
>
>  ****
>
> ~ Finally, powerful endpoint security that ISN'T a resource hog! ~
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