Well it work's, i gut now 8 Gig in my Htc 3300.
It did not go without any @#$ words.
The 3300 did not see the card at once, but with al little searching i found a tool (sdhc_artemis.cab).
http://www.xda-zone.de/useraction.php?a ... 12b8e90478
You must download it and put it on your old card, from there you install it in to your system.
Then you turn the pda off and remove the older card.
Then you format the new card to fat32 ( on your PC ) and install it in your Pda and restart it.
It's now ready to go.

Tip van Flip................
Make a backup from your older card to the pc and copy them back to your new card.

Good luck.
Btw i have WM 6, i don't know if that's make a diverance.........