請參考
https://www.tenforums.com/browsers-email/157703-live-mail-2012-screwed-up-after-v2004-update.html#post1991043
進入登入檔案:regedit 在
電腦\HKEY_CURRENT_USER\Software\Microsoft\Windows Live Mail
新增 these 3 DWORD entries (were not available for me) or change to 1 if they exist
RecreateFolderIndex = 1
RecreateStreamIndex = 1
RecreateUIDLIndex = 1
Restart Windows Live Mail