We have aUnity 4.2 install and looking through the server it appears that the c drive is about to run out fo space as the Comm Server Directory is located there as well as the remainder of the OS files. I am wondering if the comm server directory can be reloacted to the d drive which has more than enough space and if there are any other unity specific directories that coule be moved as well to help free up some space.
You can move SQL databases fairly easy. Dismount, remount on the D drive. But you probably have a bigger problem. Commserv on the C dirve is bad. Most of the C drives on the Platform disc is only 12 megs if I remember right. You will eventually eat up 12 megs just with the OS and patches, etc.
If its Voicemail only, you can also move the Exchange logs, priv and pub db to the D drive also. If it is VM only, the exchange logs only will eat the drive up if its not backed up. Log files do not delete unless you turn on circular logging or actually back up the server so they are marked for deletion.
hope this helps
Once Unity is installed, the Commserver directory cannot be moved as that's where the Unity application is installed and where the registry is pointing to. I would suggest finding out what is taking up all of the space on C: by doing a search of the entire server for *.* and then sorting by size. Then go from there.
Hope that helps,