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Hey Ardi, When we first started with Seomoz we asked ourself the exact same questions. After contacting the staff at Seomoz we know understand it quite a bit better. The way it works is that the Seomoz crawler crawls the web for 2-3 weeks. After this, it has to create metrics (such as PA/DA) out of all the data, which usually takes up the rest of the month. Unfortunately, as this is quite a huge job it takes around 4 weeks or longer. The next update was supposed to be this week, but is now being set back until the 29th. Open Site Explorer isn't the only tool you could use, one other one which was mentioned by Seomoz in the past is the Majestic Site Explorer one, https://www.majesticseo.com/reports/site-explorer . I still prefer OSE by a margin, but Majestic update their index at a faster rate. Even if some of your link aren't picked up after the update, it could be because the location of the link is on a website that isn't to popular. If that is the case, you will have to wait until further index updates, in order for it to appear.