Desktop search again

Installed Microsoft Desktop search. It does not come alone, but, as part of MSN Toolbar Suite.
So far I have tried out Google's Desktop search - Loved interface hated the lack of PDF indexing & it did not like my firewall so could not install on my home machine. Tried Coppernic - hated the interface. Interface issue was probably my personal problem, but anyways.
MSN Search asked for Adobe® PDF IFilter 5.0 that allows it to index PDFs. Thats fine by me.
Wonder why it installed ver 5.0 since 6.0 is also available but let see what happens, I can always upgrade later. Adobe site is quite silent on this product.