USE THIS AT YOUR OWN RISK

You may come to a situation where the client is unable to use an Exchange aware backup solution, and for temporary situation, they cannot use the Windows backup. So basically you need to reset the Exchange LOGs without performing any actual backup.

This is applicable to Exch 2010 & 2013 on Windows 2008, 2008R2, 2012, and 2012R2
It works with single server, as well as DAG setups

Open elevated CMD

Run Diskshadow
Type “add volume E:”
(considering E: is the drive where LOG files exists)
Type “begin backup”
Type “create”
(This action will take some time, depending on the number of LOG files exist, and connection speed)
Type “end backup”

You should notice now the LOGs are being deleted

Make a full backup after this to protect the data