I googled for this answer and I may now close this topic.
Reading the MS document "
Performance Tuning Guidelines for Windows Server 2008", MS provides the following guidelines regarding TOE features :
File server / Web Server / Database server
Checksum offload + Segmentation offload + TCP offload engine (TOE) + Receive-side scaling (RSS)
Mail server (short-lived connections)
Checksum offload + Receive-side scaling (RSS)
FTP server
Checksum offload + Segmentation offload + TCP offload engine (TOE)
Media server
Checksum offload + TCP offload engine (TOE) + Receive-side scaling (RSS)So those "guidelines" answered my question...