What skills do you need to be a successful internal communicator?

Define “internal” communicator, please. It’s not a term I am familiar with.

Internal communication as in talking to yourself? I suppose a vivid imagination will help….

By internal it means employee communications.

In that case, I’d imagine the requirements would include:
Expert communicator (preferably with degree in English)
Excellent presentation skills
Able to work independently on multiple tasks to strict deadlines
Work well in and leading teams
Politically savvy
Project management experience
Knowledge of organizational theories
Comfortable communicating to all levels of the organization

I’m sure there’s more….but that’s what I can think of right now

Harvard Business School has a terrific General Management three-month course. Rigorous and exacting, the program has one module on-campus in Cambridge and the second module in the business world.

http://www.exed.hbs.edu/programs/gmp/