Mercury in Virgo:
Mercury in Virgo people are rarely flashy in their communication style, but they do thoroughly appreciate it when others acknowledge their brainpower. These people love to keep track of all the details. They can be a little high-strung when things are not orderly or when things seem out of control, so they put a lot of energy into taking care of day-to-day, practical matters.
Mercury in Virgo men and women are generally adept at organizing, planning on a short-term scale, and doing errands. They pay their bills on time, enjoy learning the details of a trade, and generally don’t balk at secretarial tasks. They function best when they (or others) have laid out exactly what they have to do. They are generally prompt at responding to others (although a Leo Sun may be less so), and often are willing to lend a hand to others by doing research and leg work for them.
Generally, these people are considered rather useful in their work and as friends because they have a handle on the details of the things they do.
Although they are capable of learning a lot, they need orderly environments in which to learn and study, and organized study methods. They generally pick up a lot of facts and figures, and learn their own trade well, but have trouble truly absorbing the knowledge they collect on a deeper level. Although resourceful, Mercury in Virgo is not as strong at lateral thinking than, for example, water sign Mercuries.
If your Mercury is in Sagittarius or Gemini, you may find Mercury in Virgo difficult to communicate with. Although you two may share common interests, the way you deliver your message can be intensely different to the point of frustration. Learning to understand that your thought processes are different, and the way you present your ideas differ, but there is more common ground than you may know.
Mercury in Virgo natives may appear humble at times, but they get quite protective when it comes to handling day-to-day affairs. They can be very impatient with others, feel they do these things best, take on more work than they should, and then complain that they are doing all the dirty work. (Source).