Outlook add-ins provide solutions to help you better interact with Outlook and complete tasks on your messages and appointments without leaving Outlook.

Learn how to change or reset your Windows password if you've forgotten or lost it.

Training: With OneDrive, you can sync files between your computer and the cloud, so you can get to them from anywhere.

To use your microphone with apps on Windows 10, you'll need to turn on some permissions in Microphone settings. Then, you'll need to check your app permissions if you want to use your microphone with apps.

How to change your Outlook signature or add a signature. Whether it’s a new job title (congratulations!) or a phone number change, make sure you keep your email message signature up-to-date.

Learn how to use the INDIRECT function in Excel to dynamically adjust your cell references without changing your formula.

If you are having trouble with your microphone features, the following information can help you troubleshoot and resolve issues.

Learn how to install, reinstall, or activate Microsoft 365 or Office 2019 on a PC or Mac.

Use System restore to make restore points when you install a new app, driver, or Windows update, and when you create a restore point manually.

Warning: Excel provides the DATEDIF function in order to support older workbooks from Lotus 1-2-3.The DATEDIF function may calculate incorrect results under certain scenarios. Please see the known issues section of this article for further details.