Expecting it to take no more than 30 or 40 minutes, I attempted to upgrade to Movable Type 4.0 early last evening. With all of the hubbub about the new release, I thought there was a chance the process would go somewhat more smoothly than it did. I backed everything up and FTPed over the new files. But when I attempted to initiate the upgrade, I kept getting 500 Server Errors. Icdsoft customer service is usually very helpful, but this time they pointed me right back to Six Apart.