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Title
MsiDoAction Does Not Work in ISMSI Maintenance Mode.

Summary

MsiDoAction does not work in ISMSI maintenance mode.

Symptoms

The Installscript function MsiDoAction() does not correctly execute the custom action in the UI sequence of a Installscript MSI project when run during maintenance mode.

Cause

This is a limitation of Installscript MSI projects.

Resolution

The custom action will need to be sequenced to run in the Execute sequence instead.
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MsiDoAction Does Not Work in ISMSI Maintenance Mode.