Hmm.... I haven't had Archivarius installed in about 8 months, so maybe things have changed (or you've got a much bigger OST than I do), but using Direct Access it used to "rip"

through updating my 400MB OST index in about a minute and a half. BTW, I agree about the Outlook being open vs closed issue - I finally went with NOT having scheduled indexing of my OST file and did it manually whenever I could remember to do so.
I wish the developer would implement COM indexing...
Armando - what OS are you currently running? As noted above, when I switched to Vista, I finally moved to WDS and haven't looked back.