Absolutely. There was no shortage of Windows-centric corporate IT departments that swore that they'd never support Apple products.
Then iPhones started showing up in boardrooms, and they quickly changed their tune.
I brought my iPhone to work shortly after launch and showed it to curious coworkers. The head of IT for that particular multinational corp said it was garbage and would never be allowed on his network. "Apple is crapple" was his favorite phrase.
A few months later he got to peddle his anti-Apple mantra on the unemployment line.