Toshiba may have been aiming for a spring release of ICS for the original Thrive line of tablets, but apparently they missed the bullseye and have set things back until the fall. Users across the Internet are understandably upset, and rumblings speculate that they Thrive and Thrive 7 may never get ICS, but that's not what Toshiba said.

We are working hard to bring Android 4.0, Ice Cream Sandwich to our Thrive tablets. While we originally estimated it would be ready this spring, we now estimate the update will be delivered to all Thrive 10” and 7” tablets by early fall. Apologies for any inconvenience and thank you for your patience.

They don't give any reason for the delay, and we're not about to second guess them -- we're just here to deliver the news, good or bad. 

Source: Toshiba; via Phandroid