Mobilists? Asking to use Nokia Messaging on WiFi is like asking a Ford Explorer to fly...completly different designs and purposes. Nokia Messaging is for MOBILES only... that is it's purpose. Saying it's BS and that you need an official response from Nokia...is BS If you had a Nokia messaging account you would know that you can't register it to multiple phones without a reinstall of the client software on the device. What do you think that second screen in the e-mail setup is....connecting to nokia servers checking for services... it is checking if you have a nokia messaging account and if it is registered to another device. So why hop on the "I don't see it"..."I don't see it either"..."BS Nokia must hate us boo hoo" wagon. THINK. For those folk who can't see the Nokia Messaging option and want it on the N900, 1)Make sure you have a Nokia Messaging account - Duh. 2)log into nokia messaging ...click that cute little icon on the right that says re-install the software. Enter your DEVICES SIM CARD TELEPHONE NUMBER, Click the nice picture of the N900, then click next... Gee I wonder if I can do that to WiFi???? So in conclusion. No you can't use it without a SIM. No You can't use it on two devices similtaneously and yes you can reinstall it on the N900. No BS BTW I keep my personal hotspot in my pants.