There is no easy way to explain “all” things about expired domain names. As you stated Michael, Network Solutions domain names go to the partnered domain auction service NameJet.com BUT, not “all” do… NSI customers have the option to opt-out of having expired domains go to auction. If a customer picks this option, the domain name would go through the drop process and go PendingDelete around the 71st day after the expire date. When it is released from the registry, the domain name is fair game to the major dropcatching services and the private ones. This still doesn’t mean anybody would grab it, and the domain may become available to hand register.
i had a backorder for a domian that was registered at godaddy. The backorder of the domain says the domain expires feb 23, 2015. However, when i check the whois on different websites, it now says the domain is registered through feb 2016. However, GODADDY back ordering still has the domain with the expiration date of feb 23, 2015. Why would they be showing 2 different dates? The domain is not even in an auction, so the 2016 seems like the new correct date?
For example: If the domain name DomainSherpa.com is registered with Moniker (the registrar) and the domain name reaches expired status, within a few days of expiring the domain name will be listed at SnapNames.com (auction house partner to Moniker). Domain names are exclusive to one auction service, as an auction cannot take place at two locations.