If I leave my local machine on continuously for a few days then I notice that all my mapped network drives show up with a red cross. We do not switch off our servers and my machine remains on so I can access it from home using remote desktop. Our office is using SBS 2008 with exchange 2007 and we are all part of the active directory. If I reboot, then the issue does not appear for a few days again. Any ideas would be welcome.