Email encryption limits on iOS 5 ?

Hello All,
At this time, i'm in a test phase of "E-mail Encryption with iOS 5" ... and i need your experiences/feedback about.
First, small description about my environment:
-Active Directory Domain,
-Exchange 2010 SP1 RU2 server,
-MSFT CA server.
We are using Iphone 4 as mobile device for our employes which are synchronising there email on it.
In an other side, certifcat are deployed and installed to Outlook 2010 for email encryption.
Both system are running fine for a long time ago.
Monday, my boss challenge me : i have to mixe the 2 system --> email encryption on Mobile Device.
Let's go ...
- Export certificat (as .pfx files from IE with private key, etc..) = DONE
- Install certificat on Iphone (by sending it by mail or creating new profile with iPCU tools) = DONE
- Configuring email profile on Device (using SMIME + encryption ) = DONE
Last step ... do some test !
1) create new encrypted email : OK
2) read encrypted email on device: OK
Easy ..... but :
3) create email with a picture (from Camera Roll) as attachment and send it with encryption : non OK
--> email is send as non encrpyted .. and picture is not showned in outlook
4)read encrypted email with attachment ( send from outlook 2010) : non OK
--> it seems thaht my echange server is no more accpeting encrypted email ... ah bon ??!
5)forward a email with attchament (.pdf) as encrypted email to my collegue : non OK
--> email is send but is not encrpyted and attach files dissapears ...
A this time, i can ONLY read encrpyted email and create a new one but i can't working with encrypted email.
What about attachment ? forward ? etc...
Have you seen the same problems ?

Troubleshooting winmail.dat files: http://support.apple.com/kb/TS1506
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<tr>
<td> </td>
</tr>
<tr>
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<tr>
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<tr>
<img src="http://pittsburgh.pirates.mlb.com/images/homepage/team/y2011/footer/pit.png" border="0">
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<strong>About Cisco Registered Email Service -</strong> <a href="https://res.cisco.com/websafe/about">https://res.cisco.com/websafe/about</a>
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</tr>
<tr>
<td> </td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>
Test your HTML coding out before hand if you need --->
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