Upgrade Any Mac OS X Lion Installation to Lion Server via Mac App Store
Update: Yes, you can upgrade any existing OS X Lion installation to Lion Server by downloading OS X Lion Server from the Mac App Store and installing it on top of a Mac already running 10.7.
A post on HardMac suggests that any Mac OS X Lion installation will be upgradeable to Lion Server via a paid update through the Mac App Store. This was discovered by a French reader who apparently has or had access to different Lion Help documents than what exists on Apple’s US servers, since we were unable to verify this ourselves.
Apple either took down the support document in question or it never existed in the first place at least on Apple’s US Help documents server. Here’s what you’ll find if you use the exact same search operators in Lion’s help menu:
In fact, there is no reference to Lion Server at all in the Help search menu. Nonetheless, upgrading to Lion Server through the App Store wouldn’t be too surprising considering the consumer-level Lion will be installable through the Mac App Store too.