ActiveSync and 403

I'm trying to get ActiveSync to work on my Windows 2003 R2 / Exchange
2003 SP 2 setup and it keeps returning a 403 to the client.
I've now made sure that forms based authentication is switched off, SSL
is disabled for both the Exchange virtual directory and
Microsoft-Server-ActiveSync and a server cert is installed.
Basic authentication is turned on for the Microsoft-Server-ActiveSync
directory and nothing else. The Exchange virtual dir has Basic
authentication and Integrated Windows Authentication turned on.
OWA works perfectly with the server as well.
Anonymous access is turned off for both virtual directories and
From the logs I see the following:

2006-06-22 13:17:59 W3SVC1 <ip> OPTIONS /Microsoft-Server-ActiveSync
User=<user>&DeviceId=359315000215581&DeviceType=RoadSyncClient&Log=VNATNASNC:0A0C0D0FS:0A0C0D0SP:0C0I0S0R0S0L0H
80 <domain>\<user> <client ip>
Microsoft-SmartPhone/3.0+SonyEricssonM600i/R100+Profile/MIDP-2.0+Configuration/CLDC-1.1
200 0 0
2006-06-22 13:17:59 W3SVC1 <ip> PROPFIND
/exchange/<user>@<companydomain>/NON_IPM_SUBTREE/Microsoft-Server-ActiveSync/RoadSyncClient/359315000215581
- 80 - <ip> Microsoft-Server-ActiveSync/6.5.7638.1 401 1 0
2006-06-22 13:17:59 W3SVC1 <ip> PROPFIND /exchange/<user>@<company
domain>/NON_IPM_SUBTREE/Microsoft-Server-ActiveSync/RoadSyncClient/359315000215581
- 80 <domain>\<user> <ip> Microsoft-Server-ActiveSync/6.5.7638.1 207 0
0
2006-06-22 13:17:59 W3SVC1 <ip> POST /Microsoft-Server-ActiveSync
User=<user>&DeviceId=359315000215581&DeviceType=RoadSyncClient&Cmd=FolderSync&Log=V2TNASNC:0A0C0D0FS:0A0C0D0SP:1C1I465S1094R0S0L0H0P
80 <domain>\<user> <client ip>
Microsoft-SmartPhone/3.0+SonyEricssonM600i/R100+Profile/MIDP-2.0+Configuration/CLDC-1.1
403 0 0

The only thing I haven't tried is method 2 from this:
http://support.microsoft.com/default.aspx?kbid=817379

Does anyone have a clue about what I'm missing here?

Thanks a lot in advance!

Håvard

.

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