This update rollup is a security update. This security update resolves vulnerabilities in Microsoft Exchange. To learn more about these vulnerabilities, see the following Common Vulnerabilities and Exposures (CVE): :
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
You can get the stand-alone update package through the Microsoft Download Center.
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:
- Select Start, select All Programs, and then select Accessories.
- Right-click Command prompt, and then select Run as administrator.
- If the User Account Control dialog box appears, confirm that the default action is the action that you want, and then select Continue.
- 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.
Update detail information
Learn more about how to install the latest update rollup for Exchange Server 2010.
The required services are restarted automatically after you apply this update rollup.
To remove Update Rollup 21 for Exchange Server 2010 SP3, use the Add or Remove Programs item in Control Panel to remove update 4091243.
Installing this update on a DBCS version of Windows Server 2012
You can't install or uninstall Update Rollup 21 for Exchange Server 2010 SP3 on a double-byte character set (DBCS) version of Windows Server 2012 if the language preference for non-Unicode programs is set to the default language. To work around this issue, you must first change this setting. To do this, follow these steps:
- In Control Panel, select Clock, Region and Language, select Region, and then select Administrative.
- In the Language for non-Unicode programs area, select Change system locale.
- On the Current system locale list, select English (United States), and then select OK.
After you successfully install or uninstall Update Rollup 21, revert this language setting as appropriate.
Security update deployment information
For deployment information about this update, see security update deployment information: May 8, 2018.
How to get help and support for this security update
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.