In a lay man’s term BKF Files are the backup files stored on the exchange Server in Microsoft. The exchange server is a Microsoft server which stores the files sent by a user using the MS tools. Many number of people are connected to this server.
Let me tell you how this exchange server works. The sender sends an email to a person. The message first goes to the exchange server. Then a copy of the email is created on the server. Then after that the server search the person via email address and then forwards the message.
So sometimes the files copied on the exchange server becomes corrupted and they are unable to open. The only way out is to repair the BKF files and then restore the data from there.
We can do that but it is not so easy. A normal person cannot recover the BKF files from the exchange server without using a third party tool.
So he must have to use a Professional tool if he wants to access the corrupted BKF files present on the exchange server otherwise repairing the files without a tool is not possible.