The deadline for departments to have their systems .illinois.edu capable is December 31. The change to illinois.edu is a campus-wide, ongoing project with several technical hurdles yet to be solved. You can begin to use your firstname.lastname@example.org address anytime. Your email might not display that address in the FROM field for technical reasons beyond Vet Med's control. When those technical issues are solved, we will be ready and announce the changes.
For people using CITES Express, each individual can change their own FROM field. See attachment below for detailed instructions. For people using CITES Exchange, there is also a tool available. Visit http://vetmed.illinois.edu/net/?q=illinois for detailed info.
Feel free to change your business cards and signature files to the new @illinois.edu email address.