April 3, 2018, update for Outlook 2013 (KB4018303)

This update fixes the following issues:

• The custom forms with Visual Basic Script (VBScript) doesn't run in shared calendars in Outlook.
• When you send an email from a shared mailbox, the email appears in wrong Sent Items folder in some scenarios.
• Outlook crashes on startup and opens in safe mode when your preferred language list is set to a language that doesn't have a Local ID Values (LCID). For example, your preferred language is set to Javanese or Malagasy.
• You see that authentication prompts appear behind the active Outlook window and cannot be accessed.

Microsoft Update

Use Microsoft Update to automatically download and install the update.

Download Center

This update is also available for manual download and installation from the Microsoft Download Center. The updates in the Download Center can't be installed on Office Home and Student 2013 RT.

• Download update KB4018303 for 32-bit version of Outlook 2013
• Download update KB4018303 for 64-bit version of Outlook 2013

If you're not sure what platform (32-bit or 64-bit) you're running, see Am I running 32-bit or 64-bit Office? Additionally, see more information about how to download Microsoft support files.

Prerequisite

To apply this update, you must have Microsoft Office 2013 Service Pack 1 installed.

Restart information

You may have to restart the computer after you install this update.

To determine whether your Office installation is Click-to-Run or MSI-based, follow these steps:

1. Start an Office 2013 application, such as Microsoft Word 2013.
2. On the File menu, select Account.
3. For Office 2013 Click-to-Run installations, an Update Options item is displayed. For MSI-based installations, the Update Options item isn't displayed.

Office 2013 Click-to-Run installation	MSI-based Office 2013

How to uninstall this update

Windows 10

1. Go to Start, enter View Installed Updates in the Search Windows box, and then press Enter.
2. In the list of updates, locate and then select update KB4018303, and then select Uninstall.

Windows 8 and Windows 8.1

1. Swipe in from the right edge of the screen, and then tap Search. If you're using a mouse, point to the lower-right corner of the screen, and then select Search.
2. Enter windows update, select Windows Update, and then select Installed Updates.
3. In the list of updates, locate and then select update KB4018303, and then select Uninstall.

Windows 7

1. Go to Start, enter Run, and then select Run.
2. Enter Appwiz.cpl, and then select OK.
3. Select View installed updates.
4. In the list of updates, locate and then select update KB4018303, and then select Uninstall.

Learn about the standard terminology that Microsoft uses to describe software updates.

The Office System TechCenter contains the latest administrative updates and strategic deployment resources for all versions of Office.

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

x64

x86