Lexware Warenwirtschaft Pro, its a handle software(German) with all modules.
once up on a time when i was working in a company in vienna as system administraor & graphic designer. they were using this program since 2004. one day the lady who was working on this program, she has gone from the company. that time no one was there for to manage this program. As per my boss`s request, i have started to learn this program. i have learned all modules with in 2 weeks. then i have started to teach others. i have trained 3 new staffs as well. 
till that day they were using this program only for billing and adding products. but actually there were lot of modules which they dont use and that is the best for all companies. 
i have implemented Kundenverwaltung, Individuelle Kunden- und Aktionspreislisten, Artikel- und Warengruppenverwaltung, Artikelrabatte und Preisgruppen, Inventur mit Bestandserfassung und Lagerbewertung and etc.
here i have got great confidance to learn any software. also if i get a chance to work on SAP, i can do my level best.