thx again... it was really the wrong version.
he downloaded the express version which is free for one user
and he got a besx_4.1.4.exe.
now we ordred the 120-day-trial for BES for MDS applications,
and we got a besa_4.1.3.exe
and now we could install the version without any mailserver.
what was confusing: also the besx_4.1.4.exe o0ffered NONE
as choosen mailserver, but later the error was reported.
now its time to test our MDS solution
ekkehard