A good rule of thumb is: A virtual administrative assistant can do virtually everything an administrative assistant could do if they were working from home on the other side of the country. In other words, they can't pick up your laundry from the dry cleaners, but they can do just about anything that requires remote access.

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Everyday office work. Elements of your daily life, like your calendar, files, email inbox, and phone management system, can all be outsourced to a dedicated virtual assistant. Unless you need to complete office tasks on-site, a virtual assistant can help you.
Scheduling and travel arrangements. Need to book a conference a few months out? Let a virtual assistant take care of it. Need to follow up on a meeting a client missed? A virtual assistant can keep track of your calendar. If it takes too much time for you to check your own calendar, a virtual assistant administrative
can instantly increase your productivity.