I own a HTC Wildfire with a 2 GBs sd card and I'm planning on using a Rom update utility to update it from Eclair to Froyo.

since Froyo lets you install apps on the sd card, if I install the RUU (ROM Update Utility) , will my sd card need to be formatted to be used with Froyo? or can I start installing apps on the sd card I used with Eclair as soon as I upgrade my wildfire to Froyo?