How to remove Exchange Server transaction log files?
There are several ways where you can have you Exchange server to remove the transaction logs.
1- Running Full Backup on the Exchange server
2- Running an Incremental Backup on the Exchange server (* A full backup will still be needed for the first time so that there are references for the incremental backup to use)
3- Enable your Exchange to use Circular Logs
4- Manually moving / deleting your logs
The best transaction log strategy is to run a weekly Full backup and a daily Incremental backup on your exchange server. Manually removing transaction logs are to be done when backup jobs have failed. Otherwise, avoid doing this because it might cause the Exchange database stores to be at a dirty stage (consistency problem).