Support for the new Mac OS X 10 Lion as a host OS is available as of build 4.0.10311 of Parallels Server 4.0 for Mac.
IMPORTANT NOTE: You must update your server to the latest build before upgrading to Lion.
If you updated Mac OS X to Lion before upgrading Parallels Server, the dispatcher service may fail to start. Refer to this article to fix the issue:
111656: Unable to use Parallels Server for Mac after upgrade host OS to Mac OS X 10.7 Lion
For both Desktop for Mac and Server for Mac, our current support for Lion is limited to the Lion host operating system. Future versions will include support for Lion-specific features.
Please refer to this article for information about obtaining the latest build of Parallels Server 4.0 for Mac.
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