Check grammar with spelling

Supported on: At least Windows Server 2008 R2 or Windows 7

Registry

HKCU software\policies\microsoft\shared tools\proofing tools\1.0\office

Value name: powerpointspellingoptions

Enabled: powerpointspellingoptions = 5

Disabled: powerpointspellingoptions = 0

Enabling this policy to turn contextual spelling on by default.