This article describes a problem with CD or DVD drives not work, or is missing, or not recognized after installing or uninstalling programs.

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

Learn how to use the taskbar features in Windows. Hide the taskbar, pin an app, change the location, and more with taskbar settings.

Learn how to configure multiple desktops in Windows to organize projects, or to quickly switch between desktops before a meeting.

Hotmail is now Outlook.com To sign in to Hotmail, you'll need your Microsoft account username and password. Sign in at outlook.live.com

If Outlook won't open, try opening it in safe mode, which disables add-ins. 1. Right-click the Start button, and click Run. 2. Type Outlook.exe /safe, and click OK. Tip: If Windows can't find Outlook.exe /safe, try using the full path to Outlook (for example C:\Program Files\Microsoft Office\OfficeXX, where XX is your version number). More on starting Outlook in safe mode and disabling add-ins.

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The implicit intersection operator was introduced as part of substantial upgrade to Excel's formula language to support dynamic arrays. Dynamic arrays bring significant new calculation ability and functionality to Excel. Upgraded Formula Language Excel's upgraded formula language is almost identical to the old language, except that it uses the @ operator to indicate where implicit intersection ...

Outlook known issues in the June 2017 security updates Last updated: July 11, 2017 The issues documented in this section have been reported after installing the recent updates listed below. We're investigating the issues and will update this page when a fix is available. In the meantime, please use the workarounds suggested for each issue.