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Microsoft Office 4.0 is a version of Microsoft Office which released in 1993. It includes Word 6.0, Excel 4.0a, PowerPoint 3.0, Microsoft Mail, and Microsoft Office Manager. Purchasers of this version received a coupon to upgrade to Excel 5.0 and PowerPoint 4.0, as they were available shortly after.
There may also have been a "Professional" version that included Access 1.1.