Windows Mail in Windows Vista provides junk mail filtering, a fast search feature, pre-installed Microsoft Help and Support Newsgroups, and well as all the features previously associated with Outlook Express.
Windows Mail loads much slower than it needs too because it displays a splash screen.
To disable the splash screen:
1. Open a CMD.EXE window.
2. Type the following command and press Enter:
REG ADD "HKCU\Software\Microsoft\Windows Mail" /V NoSplash /T REG_DWORD /F /D 1