Q. What's new in Microsoft Windows Messenger 5.1?

improvements in file-transfer functionality for users who have multiple network connections (e.g., configurations involving wired and wireless network connections, users of VPN connections)

improvements in Windows XP Tablet PC Edition 2005 and laptop support; specifically, improved support for onscreen stylus writing and better performance when using power-saving features such as standby or hibernation in portable computers

improvements to presence integration with applications, including better presence integration when applications are in full-screen mode (to avoid unwelcome instant messaging--IM--interruptions) and quicker refresh of presence information in applications such as Microsoft Office Outlook 2003, Microsoft Outlook XP, and Microsoft SharePoint Portal Server services

improvements to the sign-on process, enabling a quicker sign-on

support for Microsoft Office Live Communications Server 2005 federation and advanced architecture features