Press and hold (or right-click) the MP4 file you want to play, select Open with, and then choose your preferred file player from the list of applications.

After you export your contacts, use Excel to open the CSV file and check that there's data. When you close the file, Excel will prompt you a few times with "are you sure you want to save it in CSV format?"

Why some files won't open in Internet Explorer. Internet Explorer uses add-ons such as Adobe Reader to view some files in the browser. If a file that needs an add-on won't open, you might have an older version of the add-on, which needs to be updated.

Smart charging will be paused and allow a full battery charge until your Surface needs to turn it on again. It may take several days before smart charging turns on again and limits your battery capacity to 80%.

Download and install Skype for Business on your PC. Sign in to and out of Skype for Business. Set up an audio device for Skype for Business. Set up and troubleshoot Skype for Business video

Here’s how to reinstall Microsoft Edge whether you’re a Windows or Mac user: Open any working browser. (Note: If you’re a Windows user and your Microsoft Edge is not currently functioning, to open Internet Explorer, type IE in the search box on the taskbar and then select Internet Explorer from the results.Or press the Windows logo key on your keyboard and then type IE in the search bar.)

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

New features gradually rolling out: Improvements to folder backup opt-out experience.We are updating the behavior when users turn off folder backup.

With PowerPoint for the web you create presentations right in your browser. Create and save your presentations in your OneDrive, and edit and share them online.

Here are a few different ways to find help for Windows. Search for help - Enter a question or keywords in the search box on the taskbar to find apps, files, settings, and get help from the web.