I’ve read the ESRI documentation here: http://goo.gl/UUSM (link to ESRI) and http://goo.gl/TsmV (link to ESRI) , so I know the documentation states that you can. And I’ve actually edited data (a very small amount) in a 9.3 ArcSDE with no problems.
For those who are actually producing & maintaining on their versioned 9.3 geodatabases with ArcGIS 10 clients, have you experienced any issues? Or has it been a relatively smooth experience (i.e works as advertised)?