A security update released on October 11 2017 removes the Home Page tab from Outlook 2010, 2013, and 2016. This change was made for security reasons but because so many applications use Folder Home Pages, a registry key will re-enable it.

There is a bug in the Calendar's Day and Week view that causes all day events to disappear when the window size changes. Adjusting either Outlook's window size (either the height or width) or the calendar size (by adjusting the width of the navigation pane or to-do bar) will show or hide the all day  

Outlook's Social Connector creates temp files in Internet Explorer's History. Learn how to slow or stop their creation and how to quickly delete them from the History list.

A number of users are reporting an error message when they try to open any Office applications: "The operating system is not presently configured to run this application"

Solution for the problem where the Office assistant does not work with Windows 7.

When you receive this error message: Could not complete the operation. One or more parameter values are not valid. while addressing or sending an email message, meeting request, or assigning a task, or saving a new contact, your auto-complete list may be corrupt. Some users also report getting this error when they save an appointment  

After installing Office updates, Outlook only starts in Safe mode.

The reading pane in Outlook 2003 is slow when I switch from different folders.

If you have Contacts in the Contacts folder but they are not accessible when you click on the To button, and they were not imported, see Outlook Contacts are missing when you click the To button for a common problem affecting Microsoft Outlook. Addresses imported into the Contacts folder from sources other than the Personal  

When you attempt to remove an add-in, the dialog tells you that only an administrator can connect or disconnect the add-in: This add-in is installed for all users on this computer and can only be connected or disconnected by an administrator.

When you use the Resend button in an NDR to resend a message, the incorrect email address may be visible on the received message.

This error affects Exchange server users with a large number of folders in their profile, either in their mailbox, public folders, or SharePoint lists. In most cases, you won't have a problem until you exceed approximately 1,000 folders, or a gigabyte of space is used. Outlook works fine for a little bit (5-10 minutes) before  

We get many questions about Office activation failing: "After installing and activating Office, Outlook keeps asking to accept the End User License Agreement (EULA)." This is caused by Windows security and permissions. Your Windows user account doesn't have the necessary permissions to write the activation to the registry. How to Fix Method 1: Right click  

How can you read email on a smartphone and not have it marked read before you read it in Outlook?

How to help prevent accidentally closing Microsoft Outlook by displaying the "you have unsent messages" dialog.