I was recently trying to decommission a Storage drive D:\ from an Exchange server
All the Databases and logs had been moved off apart from one folder D:\ExchangeLogs\OfficeGraph\GraphStorageCompactLogs which could not be deleted and it was being used and w3wp.exe ( IIS ) locked a file
Per this it’s actually ” Graph API is for hybrid Exchange 2016, since you don’t have Hybrid mode, I suggest to disable Graph API service to see if it will prevent that error events happening.
There is no way to configure this, so in the end, I have to remove the drive manually
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