Microsoft does not appear to support this and it is very possible that the data inside these binary data stores could differ.
As to sharing gaffes and permissions I can't see this as the issue here. But you can check your work on share and file permissions just in case.
I'm using 2 computers at home, a desktop with WXP SP2 and a laptop with Win7. The computers are connected in a workgroup in a home network. I'm using WLM and I'd like both computers to share the same directory on the desktop. Since telling WLM on the laptop to use the shared directory, when I open WLM on the laptop I get error 0x80070057 (calendar contains corrupt data, even though I don't use calendar), and all I can do is close it.
Is it possible to share the WLM directory between the 2 computers (WinXP and Win7), allowing me to access my mail from either one?