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Last version to support Windows NT 3.51, Windows NT 4.0 Service Packs 3 and 4, and pre-OSR2 Windows 95 and Mac OS 7.1.2 - 8.5
UPGRADE ADOBE ACROBAT 9 PDF
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HKEY_CURRENT_USER\software\microsoft\office\Outlook\addins\PdfmOutlook.PDFMOutlook
UPGRADE ADOBE ACROBAT 9 UPGRADE
If your version isn't compatible, try to upgrade your Adobe product to a later version that's compatible with your Office version. See Compatible web browsers and PDFMaker applications to determine which version of the Adobe Acrobat PDFMaker Office COM add-in is compatible with your Office version. Fees may apply when you upgrade your Adobe product.