I have Microsoft Exchange Server 2016 on-premise.
During installation couple years ago I set up 90GB disk for OS and Exchange binaries and separate disk for mailbox databases.
Currently I have only 14% free space on system drive. From time to time server system drive fills up and I occurs Back Pressure issue.
The biggest catalogues are Windows (over 25GB) and %ExchangeInstallPath% (almost 30GB).
On this disk I keep Queue Database (in my case not more than 2GB, so is isn't so big) other mailbox databases are on dedicated separate disk.
I free-up this disk as much as I can (remove unused applications, unused users accounts, empty trash, etc.) but I can't go over 15% free space.
Is there anything can I do to free-up more disk space? Especially to reduce %ExchangeInstallPath% and Windows directory size.