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Known issues: These applications and "Block credential stealing from the Windows local security authority subsystem" rule, are incompatible:
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|Application name|For information|
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| -------- | -------- |
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|Quest Dirsync Password Sync|[Dirsync Password Sync isn’t working when Windows Defender is installed, error: "VirtualAllocEx failed: 5" (4253914)](https://support.quest.com/kb/4253914/dirsync-password-sync-isn-t-working-when-windows-defender-is-installed-error-virtualallocex-failed-5)|
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For technical support, contact the software vendor.
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### Block executable content from email client and webmail
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This rule blocks email opened within the Microsoft Outlook application, or Outlook.com and other popular webmail providers from propagating the following file types:
For technical support, contact the software vendor.
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### Block Office communication application from creating child processes
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This rule prevents Outlook from creating child processes, while still allowing legitimate Outlook functions. This rule protects against social engineering attacks and prevents exploiting code from abusing vulnerabilities in Outlook. It also protects against [Outlook rules and forms exploits](https://blogs.technet.microsoft.com/office365security/defending-against-rules-and-forms-injection/) that attackers can use when a user's credentials are compromised.
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