ActiveSync for the iPhone works properly. The iPod Touch also works if you allow unsupported devices. In the following section of the mailserver.cfg file, change the value from 0 to 1:

<table name="MobileSync">
<variable name="AllowUnsupportedDevices">1</variable>

HTML and enclosures are not supported with an Exchange account. If you need these features on your iPhone, you can use an Exchange account for calendar and contacts and use an iMAP account for email.

Kerio's mail server is a terrific rock solid server that is well supported.