We know that the data base file is ***. EDB and ***. STM, at the same time, we foundmany log file(E000xxxx.log) in the same directory.My question is canwe deleteall log file? because each log file has 5MB, we have 50GB log file at all

Hi,Pleaes don't manually delete the log file. Please do a full backup right now to purge the log file.About transaction logs, Configuring Transaction Logs for a Storage Grouphttp://technet.microsoft.com/en-us/library/aa996203(EXCHG.65).aspx How to Back Up Exchange Server 2003 Databaseshttp://technet.microsoft.com/en-us/library/aa996506(EXCHG.65).aspx Frank Wang

You dont have to delete the logs manually. run Exchange full backup so that it can purge all logs. If you really want to manually delete those logs then keep logs of one whole day and start deleting rest of logs excluding res.log and e00.log files see below How to remove Exchange Server transaction log files http://support.microsoft.com/kb/240145Vinod |CCNA|MCSE 2003 +Messaging|MCTS|ITIL V3|

Thank you very much, I will run the full backup first