Immediately after Microsoft announced that Clutter was available, I enabled it in all my personal tenants and started training it. As you may recall, you can train Clutter in two ways: implicitly (as it sees how you interact with mail from particular senders, such as by ignoring it or deleting it without reading it) or explicitly (by moving messages into or out of the Clutter folder). Because I’m fairly impatient, I set about explicit training by moving messages to the Clutter folder. I’ve done this with all of the clients I use: Outlook for Mac, OWA, Outlook 2013, the iOS mail app, and Outlook Mobile. Whenever possible I move the message while leaving it unread, so as not to make Clutter think I’m interested.
The upshot: it works reasonably well, but it seems to have trouble learning about messages from some sources. For example, both Strava and Twitter alerts remain resolutely un-Cluttered even though I’ve been moving 100% of those messages, unread, to the folder. I think that’s because the message subject for these messages often changes to reflect the message contents (e.g. “@jaapwess retweeted a Tweet you were mentioned in!”) and that confuses the algorithm in some way. It may be that the algorithm used to categorize these messages needs more data to act on before it can decide. The downside of machine learning systems is that, as an end user, you often can’t see just what the machine has learned, only the actions it takes. In this regard, machine learning is somewhat like owning a cat. I can see that Clutter isn’t moving some messages I think it should, but I don’t have any way to see why, nor any way to effectively correct it. This reminds me of the good old days of training neural networks from HNC Software to do various interesting things and sometimes being bewildered by the resulting behavior.
One bit of good news: I have been very pleased to see no false positives; that is, Clutter has not taken any mail I wanted to read and treated it as clutter. If the price of zero false positives is that some real clutter isn’t treated as such, I’m OK with that.
The junk mail filtering infrastructure continues to catch some messages that might more properly be treated as clutter, e.g. the flood of marketing crap I get from GameStop. I don’t mind such messages being treated as junk, though.
One unexpected side effect is that I have been much more diligent than usual about unsubscribing from newsletters or marketing mails that I no longer care about. This has helped to cut the volume of clutter I have to deal with.
In closing, I note that no matter how many times I tell Clutter that notifications from Yammer should be treated as clutter, they keep going right into my Inbox. I suspect a conspiracy.