Multi-tasking Virtual Assistant Needed

I'm in need of a virtual assistant who can competently manage my emails and communication, schedule appointments and meetings, and do data entry and organization. The assistant should be flexible and able to use different means of communication such as email, phone, and instant messaging/chat. Proficiency in both Windows and Mac operating systems is essential, as well as a sound knowledge of the Microsoft Office Suite. Ideal candidates should possess excellent communication skills and be able to seamlessly switch between tasks.