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.

Learn how to sign in to Office or Microsoft 365 from a desktop application or your web browser.

Learn how to create survey forms with Microsoft Forms and easily share them with students, parents, and colleagues.

Office Insiders に参加して、Windows 用の新しい Outlook の使用を開始します。 最新バージョンの Outlook を最初に確認し、改善に役立つフィードバックを送信できます。

Windows PC でアプリ、設定、ファイル、写真、Microsoft Edge のお気に入りとユーザー設定をバックアップする方法について説明します。

Outlook Data Files contain your email messages, calendar, tasks, and other items on your computer.

Multiple IF functions can be nested together to allow for multiple criteria. The Excel IF function statement allows you to make a logical comparison between a value and what you expect by testing for a condition and returning a result if True or False.

You can easily insert a check mark (also known as a "tick mark") in Word, Outlook, Excel, or PowerPoint. These marks are static symbols. If you're looking for an interactive check box that you can click to check or uncheck, see: Add a check box or option button (Excel) or Make a checklist in Word. In your file, place the cursor where you want to insert the symbol.

Learn how to open and close Outlook Data Files (.pst) that contain copies, archives, or backups of your Outlook information.

The files you store on a SharePoint site are usually available to everyone with permissions to the site, but you may want to share specific files or folders with people who don't otherwise have access to the site.