Microsoft this month is releasing Exchange 2010 SP3 Update Rollup 24, but this particular update requires some special care.
If the installation isn’t done using elevated rights, the installation will fail.
When you try to manually install this security update in Normal mode (not running the update as an administrator) and by double-clicking the update file (.msp), some files are not correctly updated. When this issue occurs, you do not receive an error message or any indication that the security update is 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).
Microsoft says this issue does not occur if customers allow the installation to be performed through Windows Update – instead of what customers normally do, i.e., test first, then install manually.
There is a workaround, though:
The issue occurs because the security update does not correctly stop certain Exchange-related services. To avoid this issue, run the security update in elevated mode, as an administrator. To do this, right-click the update file, and then click Run as administrator.
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