[2] Microsoft Excel 97 でふりがな機能が実装されました。

[1] Phonetic object (Excel) | Microsoft Learn, o365devx, 2024-03-26T00:50:02.000Z, 2024-08-26T06:50:04.150Z https://learn.microsoft.com/en-us/office/vba/api/excel.phonetic

In Microsoft Excel 97, this object contained the formatting attributes for any phonetic text in the specified range.

[3] Office 97試用レポート, 2024-08-26T06:51:10.000Z https://pc.watch.impress.co.jp/docs/article/970428/office97.htm

[4] マイクロソフト、Office 98 Macintosh Editionを夏に出荷, 2024-08-26T06:52:35.000Z https://pc.watch.impress.co.jp/docs/article/980218/ms.htm