Hi,
a direct upgrade from 4.1(5.0) to 6.0 is not possible.
V6.0 needs SLES11 (64 bit), so old 32bit server can not be used.
new license is needed for V6.0.
TSW hardware : take look to "Hardware Strategy - End of Support Strategy for Older MX-ONE Hardware" on Aastra (Mitel) InfoChannel
Home \ Solutions \ MX-ONE \ MiVoice MX-ONE 6 \ Technical Information
--> ESU, Compact SM, EMG, ... can not be used any more.
best regards,
Norbert