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no, there is nothing the like. one possible way to get numbers would be to implement a feature that checks if the currently running sage instance is the most recent one and tells the user to update if it is not. then, if the clients send a unique id, one could do statistics with the data. but there is nothing the like going on. so, the best estimate is probably the number of messages on the sage-support mailing list, multiplied with a number of your choice >1 ;)