1. If the log files you have deleted are still existed, for example in [recycle bin folder],please copy them back and re-mount database
2. If logs are deleted for permanently, then you should use the follow step:
3. Stop all exchange service
4. Eseutil.exe /p “database name”
5. Remove all log files from the database folder
6. Start Exchange Service
7. Mount-Database -Identity "Database Name" -AcceptDataLoss >$true
8. [PS] C:\Windows\system32>New-MailboxRepairRequest -Database "Mailbox Database" -CorruptionType ProvisionFolder,FolderView,SearchFolder,AggregateCounts
9. Check the mailbox works normally