In our working life, we have many different kind of people we want to or have to communicate with (hopefully using the best communication tool).
There are several official moments /ways (often meetings) in which we do these kind of communications but no matter how good we are in managing this net, there is always something that gets outside of it: there is always that question that you have to answer or that particular person that you have to update in a different way.
The golden rule of this kind of extemporaneous update is:
you have to update your counterpart one minute before he grab the phone and call you asking for that update.
Too soon is spam, too late is … too late.
When is that moment happening?? I cannot answer for you 🙂 as you know that guy, you know the way he works, you know the way he communicates but remember, you have to anticipate him!