I work at a midsized global company (~3000 employees), and I recently have had the opportunity to train a new employee. The new guy asked about IM at the workplace, and I told him to have the IT department install MS Office Communicator on his machine, because from what I understood the company had been using Communicator for the past year. He, put in a help-desk ticket with IT, and this was their response:
"Office Communicator is only being installed after approval when needed for communicating to our sister companies overseas. They do not want users using up the band with to IM each other internally. This may change once the new infrastructure gets in place someday."
Is there any bit of truth to this claim? Can IM traffic actually use that much bandwidth? Our only alternative is to bombard the MS Exchange server with e-mails back and forth (or call the other person on the phone.)