An anonymous reader writes: Defect in MS OneCare AntiVirus results in Outlook .pst mail folders to be deleted.
This issue has been lingering for some time, and does not seem to be a priority for the vendor.
ref. http://forums.microsoft.com/WindowsOneCare/ShowPos t.aspx?PostID=1150100&SiteID=2 /. MS Bashers will have a good time with this one :-)