Great news reached me today from HP regarding the iPAQ H5400 Wireless Pack support. As you might know, currently this iPAQ doesn't works for any reason with the old Compaq Wireless Pack which is a kind of sad.
However, this situation will changes soon as the appropriate drivers/support is in development and can be expected sooner or later! :-)
So stay tuned, your "beloved" Wireless Pack will works with your "beloved" H5400 soon, believe me. ;-) Then, the H5400 will become the ultimate wireless Pocket PC with PAN, LAN and WAN access/support! Woohoo... ;-)
Cheers ~ Arne