If you use Microsoft's Messenger service for instant messaging in your office -- and Microsoft sure hopes you do-- you may have experienced something unusual this week. Users of Microsoft Office Live Communicator 2005 and other Messenger clients were directed to this support page and told they needed to re-register their accounts in order to continue to use the service, now called Windows Live Messenger Service. If you use Microsoft’s Messenger service for instant messaging in your office — and Microsoft sure hopes you do– you may have experienced something unusual this week. Users of Microsoft Office Live Communicator 2005 and other Messenger clients were directed to this support page and told they needed to re-register their accounts in order to continue to use the service, now called Windows Live Messenger Service. While Windows Live Messenger is hardly the leading corporate IM platform, it’s in use enough that many systems bridge to it. And users of those systems will have to go through the re-registration drill in order to stay connected–and then wait as much as several hours for their connection to come back again.So, if customers and partners who you communicate with over Office Live Communicator have suddenly disappeared from your users’ contact lists, this might be the reason. Software DevelopmentSmall and Medium Business