Recommendation 11 (Internet Voting) Estonia 2007
http://aceproject.org/ero-en/regions/europe/EE/estonia-election-assessment-mission-report/at_download/file
In addition, the OSCE/ODIHR recommends that unless the challenging issues pertaining to internet voting outlined in this report can be effectively addressed, the authorities should carefully reconsider whether the internet should be widely available as a voting method, or alternatively whether it should be used only on a limited basis or at all.