I'd be amazed if anyone actually needs Microsoft Office for work. Unless the systems they're using involve incredibly complex macros (which 99.9% of ordinary users never encounter), any of the main freebies (OpenOffice, LibreOffice or WPS Office Free) are just as good and fully compatible.
I suggest downloading and installing LibreOffice
https://www.libreoffice.org
and then changing its default 'Save' settings to automatically use Microsoft Office formats:
https://www.lifewire.com/how-to-save-libreoffice-files-in-microsoft-ms-office-format-4684739
(Note that LibreOffice now offers 'Word 2005-365(*.docx) as an option, rather than 'Word 2007-2019 (*.docx) as shown in that link).
If Mrs W really wants Microsoft Office though, Microsoft would love her to commit to spending money regularly by subscribing to Office 365. However, although they try to keep very quiet about it, one can still purchase Microsoft Office 2019 as a one-time purchase. It costs £119.99 for the Home & Student edition, with Word, Excel, and PowerPoint (but NOT Outlook)
https://www.microsoft.com/en-gb/microsoft-365/p/office-home-student-2019/cfq7ttc0k7c8?activetab=pivot%3aoverviewtab
or £249.99 for the Home & Business edition, which adds in Outlook
https://www.microsoft.com/en-gb/microsoft-365/p/office-home-business-2019/cfq7ttc0k7cq?activetab=pivot%3aoverviewtab
Note 1:
There are loads of websites that offer those products cheaper but, by buying through an unofficial source, you risk ending up with something dodgy on your computer.
Note 2:
If using either LibreOffice or the Home & Student Edition of Microsoft Word, Thunderbird can be used to replaced instead of Outlook for emails:
https://www.thunderbird.net/en-GB/