A co-worker shares office gossip/rumors with you. You:

It is acceptable to leave on your personal cellular phone during office hours and answer it when it rings.

When corresponding with a business contact by email you should:

When breaking the ice with a contact at the beginning of a meeting it is appropriate to discuss such things as the weather, politics, and traffic.

When meeting a contact of the opposite sex the man should wait for the women to initiate the handshake.