Microsoft is retiring some legacy layout settings in Word, potentially rearranging documents created or last saved in Word 2010 or earlier.
"Affected documents may show layout differences, such as text reflow, changes in spacing or page count, or images and shapes moving to another page," the Windows biz said.
The advice, if silly little things like page layout in a document matter, is to "consider exporting it to PDF before the change."
Compatibility Mode lets a newer version of Word open a document created in an older version, such as Word 2010, without changing its layout. Newer features are switched off while the document is open this way. Users can convert the document to unlock newer features, although people using older versions of Word may then have difficulty editing parts of it.
Microsoft has not identified the individual settings being retired, saying only: "We are retiring a set of compatibility options in Microsoft Word (desktop app) for documents in Compatibility Mode." The reason? "To simplify how Word handles document layout and provide a more consistent experience across platforms."
Administrators may therefore want to check older templates, forms, and other documents whose pagination needs to stay put.
The change is due to begin rolling out in the Windows version of Word from December 2026 and be completed by January 2027. The Mac version will follow in early 2027.
Microsoft Word is more than 40 years old, and its first Windows version was released as the 1980s drew to a close. The word processor has evolved over the decades and is a mainstay of Microsoft's productivity suite.
Compatibility Mode helps keep older documents from having their layouts abruptly borked the way Word does so well. Losing some of those safeguards could give administrators a fresh batch of "what the heck has happened to this document?" tickets as the change rolls out. ®