Took over NT4 / 5.5 server. Disk space got low approx 200mb. Heaviest user (only 3 users) said she wasn't getting calendar reminders any more. As I am Exch Server newbie, cloned to a larger hard drive as I knew I couldn't possibly reload all server software. Lots of space now, still no reminders. All else appears working fine. What additional info do you need?