Higher heels are no longer as popular as they used to be. Flat leather shoes with dark, coordinating trouser socks are appropriate. DO Remember that shoes are part of the environment. Keep them cleaned and polished. Research your office environment.
Every office is different.
Project your professional image, not your sex appeal. Dress like a man. Actually, this isn't so much a taboo as an outdated style of dress. There is plenty of female work attire available these days. Overdo make-up and accessories.