In a three-year contract, the number of desktop computers and qualified users can be adjusted for each anniversary of the contract. This allows for greater flexibility to meet changing requirements. Use rights are limited and expire when the contract expires. You need to make sure your customers sign the security form with their FDWs. The EDOS program is ideal for large companies and government organizations with more than 5,000 users. As part of an EA, customers can subscribe to microsoft online services such as Microsoft Exchange Online, SharePoint Online and Lync Online. Services should not be licensed at the company level, but can be reserved for each user. The customer granted either the standard edition or the corporate edition of each service. The validity of the EDOS is three years and is related to an EA.