I have a an issue with Windows based servers running VM pro. They are set up as distributed and have been working fine for about 8 months. However every so often users begin to report that they aren't getting their messages. When I check the Centralized server the Distributed one appears to be "In Progress". In the pass I have restarted the service and it begins to synchronize until it goes back to "Up To Date". This time the solution has not been that easy. I restarted the services yesterday and as of now it continues to report that it's "In Progress". I would like to get to the root issue that is causing the servers to not stay "Up To Date". Any suggestions would be greatly appreciated.