The term officelrcab (commonly OfficeLR.cab or officeLR.cab, case-insensitive) refers to a CAB (cabinet) archive used by Microsoft Office 2007 (and related Office installers/trials). Errors mentioning OfficeLR.cab typically occur during installation or when Office tries to repair/update. The core causes are: missing/corrupt CAB in the install source or MSOCache, path/permission issues, bad extraction from media, conflicting or leftover Office components, or hardware/OS incompatibilities.
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