What you can do, is point WLM, in the advanced options, to a created folder. I have two on my extra hard disk. Logically, they are called Win7Mail and Win8Mail. Only problem is, I have elected to allow my server to keep mail for a specific number of days, so, as 7 is my primary OS, and will remain so for some time, I first check there, before rebooting into Windows 8 and, just to keep the test going, check my mail there.