Merging 3 completely different NetworksLocked
I have a real interesting issue that i MUST resolve. Currently our company is going through a merger and i have been tasked with the job of joining all 3 different companies networks into one functional network. My problems are all 3 networks are using Exchange and all 3 of course are a primary domains.
My question is. Is there a way i can link the 3 networks together other then using trusts so that everyone can see each others files browse exchange servers for calendar sharing and such without having to start from scratch and join everyone on 1 at a time. We are looking close to 500 users so if it is the case of starting from scratch i feel i may need to invest in alot of red bull.
Everyones help would be greatly appreciated.