You perhaps need to find out if the new motherboard
has the extra P4 compliant power plug and if so, does your old PSU have the appropriate connector?
Also if the PSU rating is up to running the new CPU/motherboard combination.
The motherboard should fit, just relocate the case/motherboard standoff's to the appropriate mounting points so that they align with the new mount holes.
You may need some slot blanks, micro ATX boards generally have no more than 3 PCI slots so probably leaving you with a couple of slots to cover.
I have to say that given the choice a full ATX motherboard is prefered as they generally offer more upgrade potential.
Martin
Replying helps further our knowledge, without comment leaves us wondering.