Exactly 28 years ago today, Microsoft packaged its existing Office productivity apps for the first time and sold them together. But the initial version of the iconic Office suite was only available for Apple's Macintosh computers.

On August 1, 1989, Microsoft debuted what would become its most well-known set of software programs, the Microsoft Office suite, according to the company. At the time, individual Office apps had been available for Mac, including Excel, PowerPoint, and Word. But August 1 marked the first time they were packaged and sold together, according to MakeUseOf.com.

The Office suite was released for Windows during October of 1990, a little more than a year after the Mac package.

Why did Microsoft release Office for Mac first? According to YourMacExpert.com, the Mac audience was less important to Microsoft's success, so it felt more comfortable testing features and changes on the Mac versions before officially rolling them out for Windows. That website cited an internal email exchange between Bill Gates and another Microsoft executive:

Because Mac Office is so much less critical to our business than Windows, we have the flexibility to test out new things in the product and in its marketing before we try them on Windows … I've personally also found the Mac market interesting because I've seen so many trends appear there first, and eventually become important on Windows.

Today, nearly 30 years later, more than 1.2 billion people in 140 countries use Microsoft Office in 107 different languages, Microsoft says.

That's a whole lot of Word docs and Excel cells. And it all started on August 1, 1989.