I have a 100gb partition where Exchange 2010 is installed and my free disk space got down to less that 4gb and we stopped receiving external emails. I was able to delete an old test db that was no longer being used to free up another 3gb which got emails temporarily flowing for now. However, I know I need another permanent solution to resolve the issue. My first thought was to just expand the virtual disk as I have some additional storage space available to me with my data center vendor. My question is: Is it safe to just expand the virtual disk that contains Exchange or am I at risk of causing some serious problems? Does anyone have any other suggestions? I know I could ask users to cleanup some emails by exporting older emails to PST files, but really want to try and avoid that if I can.