OE6 generates Inbox (1).dbx

When i was working on the store folder of Outlook Express. It has a complete of *.dbx files. I tried removing the Inbox.dbx to another location and normally Outlook Express will generate a new Inbox.dbx.....That's fine.
But in other computer, the existing filename for Inbox was "Inbox (1).dbx" when i removed the "Inbox (1).dbx" to another location it still generate an "Inbox (1).dbx". How can i set it back to Inbox.dbx?. Your help is highly accepted.