hey dude, I work at Optus.. tech support, I'm serious(no im not based in India!) Dude, you are lucky to have been sending 5MB emails previously, Optus mail servers are set to only allow 2MB files. Try using Optus Webmail to send the same file: http://webmail.optuszoo.com.au/ use you optus cable username (first part of your Optus email) and password. If that fails then you know it's the Optus mail servers finally catching up with you. If it works then reinstall outlook.