We have 1 Exchange 2010 Server in our organization.
On this server we have multiple domains.
one is our main public email domain: "ourdomain.com"
one is our internal email domain: "INTERNAL"
there is one more domain by the name: "ourdomain.ch"
all usersaccounts are on the same AD Organization, but have different email adress domains.
Problem: Users from one naildomain are not able to see calendars of users from other mail domains even thought they are shared.
In Outlook we get a error like this (see attachment screenshot).
Can someone point me towards the source of this error?