We are testing out whether Sharepoint might be suitable to allow external users
access to key docs within the organisation.

Does anyone know whether it's possible to set the default 'home' page for an
external user to go to a given folder ?

We want people to access https://docs.mydomain.com/ and logon and see the docs
they are allowed to see (which will all be in a pre-named folder). Currently,
they get external access but they have to go to
https://docs.mydomain.com/<username>/<folder>, which isn't as fluid really.