A project in the realm of both information technology and the European Commission would not be short of abbreviations. We'll try and help you a bit.

AB	Advisory Board
ACL	Access Control List
AEM	XtreemOS Application Execution Management
B2B	Business to Business
B2C	Business to Consumer
EC	European Commission
EU	European Union
FP7	Seventh Framework Programme
GAFS	Global Autonomous File System
IaaS	Infrastructure-as-a-Service
IPR	Intellectual Property Rights
IST	Information Society Technologies
KVM	Kernel-based Virtual Machine
OCCI	Open Cloud Computing Interface
OGF	Open Grid Forum
OpenID	Distributed identity system
OS	Operating System
PaaS	Platform-as-a-Service
POSIX	Portable Operating System Interface [for Unix]
QoP	Quality of Protection
QoS	Quality-of-Service
SaaS	Storage-as-a-Service
SAML	Security Assertion Markup Language
SAS	Statement on Auditing Standards
SLA	Service Level Agreement
SP	Sub-project
SQL	Structured Query Language
SSL	Secure Socket Layer
VCP	Virtual Cluster Platforms
VIN	Virtual Infrastructure Network
VM	Virtual Machine
VPN	Virtual Private Network
WP	Work package
WS-Agreement	Web Services Agreement Specification
X.509 ITU-T	standard for a public key infrastructure (PKI) for single sign-on (SSO) and Privilege Management Infrastructure (PMI)
XtreemFS	XtreemOS Grid file system
XtreemOS	Grid Operating System