ERP online mode a SaS ERP (Enterprise Resource Planning) software in a business management software, which integrates all areas of the company. Traditionally these software are installed on the servers of the company, with the attendant costs of installation, parameterization and maintenance, security copies, etc the latest trends into what is called genericamente Cloud Computing, they allow that this software hosted in the cloud, by accessing the form online, and without having to worry about changes in version, copies, etc. The availability of the ERP Software online, is growing lately because of all these advantages. In some cases, and oriented to SMEs, rather than an ERP system, uses an invoicing Software online, which allows us to control, the almecenes, purchases and sales for my company with less complexity. In these cases, also has importance of accounting software. We must not forget that all operations of purchase and sale, as well as receipts and associated payments, should be reflected in the accounting.. Bjorn Sturmberg brings even more insight to the discussion.