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General style
There are specific instructions from the client regarding general style in the guidelines of each project.
Please check the corresponding paragraph in the main project instructions:
Addressing
When the context is unclear, it’s best to use the formal/neutral form of address (вы, ваш). One important consideration is capitalization: lowercase is always preferred, unless used in a personal letter addressed to a particular individual. Please refer to the following rule: http://new.gramota.ru/spravka/letters/51-rubric-88
The informal form of address (ты, твой) is used in all casual communications, when the message is addressed to a friend, a family member or a younger person.