Hi Eric,
It is a cobbled-together solution but works for me as well. Thanks for your guidance.
I was considering to cease my paid Tripit subscription but with this temporary fix I'll wait a bit longer to see if this bug can be fixed - I also like the real-time updates like flight delays, gate changes etc. which are not in the free version.
Still don't understand where the problem is; all worked fine until I had to reinstall the web calendar after I switched to the 'new' Outlook, where it did not install anymore. I'm back with the 'old' Outlook as the new version does not work offline (very inconvenient if you travel a lot, another bug for Ms to fix). Re-installation of the web calendar in my old Outlook does not work either anymore. Luckily, with this workaround I have access to my trip itineraries through my calendar again.
Martin