Collaboration between collaborative endpoints may be facilitated by a serverless publication service of a collaborative services platform. The serverless publication service may be configured to accept communicative connections from the collaborative endpoints. Users of the collaborative services platform may publish their associated collaborative presences with the serverless publication service. For example, the collaborative presence of a user may include information with respect to valid collaborative endpoints for the user and collaborative capabilities at those endpoints. Subscriptions to published collaborative presences may be placed through the serverless publication service. A collaborative presence subscribe message may specify a subscription to a collaborative presence of a user. Upon receipt of a presence subscribe message, if there is no subscription policy with respect to the sender, the recipient may be queried for a subscription policy with respect to the sender. The subscription may be accepted in accordance with the subscription policy.