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Microsoft confirms April Windows updates cause backup failures

UnknownMay 4, 2026(about 2 hours ago)

Microsoft confirms April 2026 Windows updates cause failures in third-party backup applications using the psmounterex.sys driver.

Microsoft has confirmed that the April 2026 security updates are causing failures in third-party backup applications using the psmounterex.sys driver. [...]

Potentially Affected Vendors
Microsoft Azure

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