Description of the security update for Microsoft Exchange Server 2013 and 2016: May 8, 2018

Exchange Server 2013 EnterpriseExchange Server 2016 Enterprise Edition

How to get and install the update


Method 1: Microsoft Update

This update is available from Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog website.

Method 3: Microsoft Download Center

Known issues


  • Exchange services may remain in a disabled state after you install this security update. This condition does not indicate that the update is not installed correctly. This condition may occur if the service control scripts experience a problem when they try to return Exchange services to its usual state. To fix this issue, use Services Manager to restore the startup type to Automatic, and then start the affected Exchange services manually.To avoid this issue, run the security update from an elevated command prompt. For more information about how to open an elevated command prompt, visit the following Microsoft webpage: Start a Command Prompt as an Administrator

  • When you try to manually install this security update in "normal mode" (not running the update as an operating system administrator) by double-clicking the update file (.msp), some files are not correctly updated. When this issue occurs, you don’t receive an error message or any indication that the security update was not correctly installed. Also, Outlook Web Access (OWA) and the Exchange Control Panel (ECP) may stop working. This issue occurs on servers that are using user account control (UAC). The issue occurs because the security update doesn’t correctly stop certain Exchange-related services.

    To avoid this issue, follow these steps to manually install this security update:

    1. Select Start, select All Programs, and then select Accessories.
    2. Right-click Command prompt, and then select Run as administrator.
    3. If the User Account Control dialog box appears, confirm that the default action is the action that you want, and then select Continue.
    4. Type the full path of the .msp file, and then press Enter.

    This issue does not occur when you install the update from Microsoft Update.

Security update deployment information


For deployment information about this update, see security update deployment information: May 8, 2018

File information


Exchange server file information

The English (United States) version of this update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and 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 times may change when you perform certain operations on the files.

How to get help and support for this security update


Help for installing updates: Windows Update FAQ

Security solutions for IT professionals: Security Support and Troubleshooting

Help for protecting your Windows-based computer from viruses and malware: Microsoft Secure

Local support according to your country: International Support