I confirm that it's not possible to view the Ovi store from the N900's built-in browser.

About half of the Ovi Store-to-N900 process works. That's intriguing. Using my desktop computer and Firefox, I can log into Ovi Store. On the "Account" page, I identified my phone as the N900 and typed in my mobile phone number. Ovi Store sent me an SMS, asking me to confirm my phone number. I confirmed by clicking on the URL in the text message.

At Ovi Store, I tried sending the "Snow Globe Touch" application to my N900. Ovi Store sent me another SMS announcing, "talmage has shared Snow Globe Touch with you." along with the URL of the application. Alas, this is where Ovi Store failed. When I clicked on the link, all I got was the "Ovi Store is currently not available for your device." page.