E-mail has rarely discussed disadvantages: E-mail empowers the sender. They can put in your inbox whatever they like and as many times as they like (many receivers use filters and rules as countermeasures). E-mail is a closed channel. There's no way to see an e-mail if you are not on the “to” list, forcing work groups to err on the side of including everyone. Only a fraction of e-mail has direct relevance to any particular person. E-mail decays over time. If someone writes a great e-mail, an employee has to do something to preserve it. Otherwise it sits in an inbox, hidden from new employees.
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