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I have ML and SL installed as dual boot OSes and want to share a user's home directory (on an external drive). I wonder, however, if I rather should use different users for each OS as ML might write content to the user preferences which SL might confuse.

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I strongly suspect that sharing a single home directory across different OS Xs will cause you problems. For example, after upgrading from Lion to Mountain Lion both and had to upgrade my local data (i.e. calendars and mail boxes respectively). My hunch would be that the upgraded data would no longer be accessible from the older OSs.

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I tried this before reading this question. Specifically, I have two drives, SSDs sitting on PCI cards, each running its own OS.

I had set up iTunes music collection to be on a standard drive, but to open when running either OS. After running it under ML, it no longer worked under SL. So Nick's hunch seem correct.

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