> Microsoft Office 98 Macintosh Edition was unveiled at Macworld
> Expo/San Francisco on January 6, 1998. Office 98 was re-engineered
> by Microsoft's Macintosh Business Unit to satisfy customers' desire
> for more Mac-like software. It included drag?and-drop installation,
> self-repairing applications and Quick Thesaurus before such features
> were available in a version of Office for Windows. It also was the
> first version to support QuickTime movie. The applications in
> Microsoft Office 98 were:
>
> * Microsoft Word 98
>
> * Microsoft Excel 98
>
> * Microsoft PowerPoint 98
>
> -Wikipedia

The first download link above is a CD image containing Microsoft
Office 98 base installation as well the optional extras.

The second one is a stuffed directory of an installed Full Version of
Microsoft Office 98 in German.

The fifth download link is a combined updater released in 2000 that is
a combination of the previously released "Unwanted Data" updater, the
"Mac OS 8.5" updater, and the "Unique Identifier" updater. It also
includes the previously released "Memo Wizard/G3" patch to "Visual
Basic for Applications". The combined updater is also available
[here][1] via the Wayback Machine.

Sixth link (FR) is another stuffed folder of an installed full version
of MSO 98 in French.
Link #7 is a stuffed folder of an installed version of MSO in Italian
(Word, Excel, PowerPoint tested and working on PowerBook 1400CS; no
luck with emulators, yet).
Link #8 is a CD image of Microsoft Office 98 in Italian.
Link #9 is a stuffed folder of Microsoft Office 98 in English.
Link #12 is an update for Office 98 providing Mac OS 9.0
compatibility. It is available in French, Spanish, German, Italian and
Swedish.
Link #13 is a security update for Microsoft Office 98 in Swedish.

Compatibility
Architecture: PPC

[SheepShaver compatibility][2] is limited: For reasons long debated
and not overcome, Office 98/2001 will not run at all in SheepShaver if
the host is OS X / macOS; it can run on Windows/Linux hosts with some
configuring but may remain unstable. Runs fine in QEMU/UTM.

  [1]: https://web.archive.org/web/20030811012939/http://www.microsoft.com/mac/downloads.aspx?pid=download&location=/mac/download/office98/Off98Updater.xml&secid=20&ssid=1&flgnosysreq=False
  [2]: https://www.emaculation.com/forum/viewtopic.php?p=37231&hilit=office+japanese+language#p37231