FSLogix

FSLogix is a set of profile management and application access technologies for Windows virtual environments. Originally developed by FSLogix and acquired by Microsoft in 2018, it is used to manage user profiles and app data in non-persistent VDI and Remote Desktop Services environments. It is now widely used with Azure Virtual Desktop (formerly Windows Virtual Desktop) and other Microsoft virtualization deployments.

The core components include Profile Container, Office 365 Container, App Masking, and Cloud Cache. Profile Container stores the user profile in a VHD(X) file that is mounted to the user's session, enabling a consistent profile across sessions without relying on roaming profiles. Office 365 Container provides a separate VHD(X) for Office 365 data such as OneDrive, Outlook data, and cache to reduce logon times and mailbox replication. App Masking allows per-user or per-group visibility rules to enable or hide applications without changing the base image. Cloud Cache is a cache layer that can reside on the local device and/or a network share to speed sign-in and provide resilience when the network is slow or unavailable.

FSLogix is installed as an agent on session hosts and targets a storage location for containers, typically a SMB file share or compatible storage. It supports deployment on Windows Server and Windows client editions used in VDI/RDS scenarios and integrates with Office 365 and other Microsoft virtualization workflows.