Hi, thanks for your comments.
I created a guest account on the PC for other reasons and logged through this account and WHAT A SURPRISE !
The PC Migration client poped-up at the first boot but only with the Guest Account, the Admin one doesn't work.
I then rushed to the Mac, launched Fusion and unfortunately when the 4 digits code were keyed-in on the iMac the connection, once again, could not be established.
Obviously the issue is on the PC side as, today,I can't connect to the PC via the Finder, which I could do the other days.
Windows is strange
: one more reason to move out.
I will have an other try after changing my Admin profile, id and passsword; who knows?
It reminds me of "who's John Galt?" ...
Thanks for the comments.
Marc.