For Skype application, the chat logs are stored into the main.db file of skype user folder. Now I want to backup my chat logs from Skype for business application. I am trying to find out the chat logs file like main.db but it does not exist for business application. Where is the Skype for Business stores users chat log in Windows 7?
Either in the cloud or in your main.db - it depends on your own settings. If you can't see them in main.db you may need to change your settings. More here: https://support.skype.com/en/faq/FA392/where-can-i-find-my-conversation-history-in-skype-for-windows-desktop-and-what-can-i-do-with-it