"What this is really about is Microsoft and Citrix as a team going against VMware," said Mark Bowker, an analyst with Enterprise Strategy Group.

The tools in Citrix Essentials include StorageLink, for provisioning and managing virtual machines across large storage area networks; dynamic provisioning, which allows thousands of virtual machines to be booted simultaneously from a single master image; and a new "lab management" tool for creating virtualized test and development environments. It will also have a graphical tool for automating a workflow of complex management tasks.

The version of Essentials for XenServer will include the high-availability features that are currently in the Platinum edition of XenSource 5. Those features will not be in the version for Hyper-V.

"Citrix Essentials for Hyper-V is a much-needed step, especially for Microsoft," according to Chris Wolf, a senior analyst with Burton Group.

The storage and provisioning capabilities will be a boost for Microsoft, although the lack of a high-availability option will make some enterprises hesitant about using Hyper-V for production applications, Wolf said. At least initially, he expects the Microsoft platform to be more widely used for virtual test and development environments.