If you are using Sharepoint as your document repository, you may came across with a situation where your users are prompted for login credentials whenever they try to open any document of document library in Microsoft Word. This is very irritating and can ruin the objective of user productivity.
You can resolve this issue very easily. It happens actually if your Sharepoint site is not in the trusted zone of IE. You can verify this by looking at the bottom right of your browser window as follows:
If you see the word “local intranet” or “Trusted sites” then only you can open your documents without getting prompt of login credentials. Just add your Sharepoint site into the “Trusted sites” zone and bingo! MS Word will stop prompting you for your credentials. Enjoy!