Summary. Microsoft Office Excel support Automation Add-ins in addition to Component Object Model (COM) Add-ins. This article explains the differences between these two types of Add-ins.

Learn how to sign in to your Hotmail account, now known as Outlook.com, and access your emails.

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Hotmail is now Outlook.com. Learn how to sign in to access your Outlook.com, Hotmail, Live, or MSN email account.

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

If you’re working on a Windows PC and want the apps and content from another device to show on your PC screen, you’ll want to consider mirroring that device‘s screen or projecting it to your PC.

Learn how to create installation media for installing or reinstalling Windows 7, Windows 8.1, or Windows 10.

When you check Outlook Desktop for the Teams Meeting Add-in by going to File > Options > Add-ins, then select Go next to COM Add-ins, the Teams Meeting Add-in is missing.

Learn how to install Office 2013 on your PC or Office for Mac 2011.

Try these solutions if you can't sign in to your Outlook.com, Hotmail, Live, or MSN email account, or you're not sure how to sign in or sign out.