embedded capped collections with numeric limitation, no memory limitation

[FredO]

I have requirement to maintain a list of N most recent emails for
each of my account-objects.

It would be cool if there were some way to declare an embedded
collection as having a limit of N objects such that as the limit was
reached, when you add a new object the oldest object would be removed.

It would be be even cooler to be able to update the numeric limit
after the collection was created.

I would think this a common enough requirement that it would make
sense to incorporate this kind of artifact in Mongo.

Or is it there already?

[Eliot Horowitz]

Nothing that works great for that currently.
If they are ordered, it would obviously easy to build on top of mongo.

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[Barrie]

 I think what you're looking for is this : https://jira.mongodb.org/browse/SERVER-991

You can track and upvote the feature there.