http://192.168.2.20/blogs/doverton/archive/2006/03/13/73.aspxOK, so I did not realise we had actually written this up, but at http://go.microsoft.com/fwlink/?LinkId=62797 is the document you need to help you do this. One quick point to make, with Windows Mobile 5.0 you can no longer turn off Certificate CheckingenCommunityServer 2008.5 SP2 (Build: 40407.4157)http://192.168.2.20/blogs/doverton/archive/2006/03/13/73.aspx#98Fri, 17 Mar 2006 08:17:11 GMT72050d9c-4f41-4a16-9f70-ebbf2c98a2c7:98David OvertonPaulie, <br> <br>This is of course true *IF* your device manufacturer/contract provider allow this. &nbsp;Some do, some do not. &nbsp;I would rather that people were aware of the issue rather than found out after a number of activesync error around security. <br> <br>Quite right to point this out - you can install the certificate if the device allows. &nbsp;This generally aligns to phones do not allow it &amp; PDA device do allow it. &nbsp;Of course this is confusing as some phones run the PDA edition of the software :-~ <br> <br>ttfn <br> <br>David<div style="clear:both;"></div><img src="http://192.168.2.20/aggbug.aspx?PostID=98" width="1" height="1">http://192.168.2.20/blogs/doverton/archive/2006/03/13/73.aspx#97Fri, 17 Mar 2006 08:01:40 GMT72050d9c-4f41-4a16-9f70-ebbf2c98a2c7:97PaulieExcellent! Will have a read later, I think mobile devices have huge potential. <br> <br>Just a note to say that self signed certificates with SBS do work without a problem. &nbsp;You just have to install the certificate on your device first! <br> <br>I run Tom Tom on mine which works great.<div style="clear:both;"></div><img src="http://192.168.2.20/aggbug.aspx?PostID=97" width="1" height="1">