Microsoft has re-released the KB5002934 update for Excel 2016 after a later update brought back a bug that breaks copy and paste in some workbooks. According to the updated KB5002934 support page, the new release moves Excel 2016 to build 16.0.5574.1006 and fixes a paste failure that returned in build 16.0.5574.1005.
The bug affects workbooks that contain conditional formatting. In those files, paste operations might fail. Microsoft first broke copy and paste in Excel in September, shipped a fix, and then saw the same problem return with another update this month.
The re-released update keeps the KB5002934 number, but it is not the same package that shipped last month.
What Changed in the Re-Released KB5002934 Update
Microsoft explains the change directly on the support page. The page originally described build 16.0.5574.1005, and Microsoft has since updated the release to build 16.0.5574.1006 without assigning a new KB number. According to the company, build 16.0.5574.1006 "includes all security updates for Microsoft Excel 2016" and also fixes the reintroduced issue "in which paste operations might fail if the workbook contains conditional formatting."
Two consecutive updates have now broken the same Excel function. A re-release under an existing KB number is uncommon for Microsoft, and the company has not explained how the paste problem made its way back into Excel after the September fix.
The scope is narrow. Only Excel 2016 is affected, which is an older release of the spreadsheet app, so the number of impacted users is smaller than a bug in a current Microsoft 365 build would reach. Organizations that still run Excel 2016 on managed PCs are the main group that needs to act.
How Excel 2016 Users Can Restore Copy and Paste
Excel 2016 users who saw paste operations fail in workbooks with conditional formatting should move to the revised release. The fix is part of the security update itself, so there is no separate hotfix to hunt down.
- Confirm that the affected installation is Excel 2016 and not a newer Office or Microsoft 365 version.
- Check the Excel build number. Build 16.0.5574.1005 contains the reintroduced paste bug.
- Install the re-released KB5002934 update so that Excel 2016 reaches build 16.0.5574.1006.
- Open a workbook that uses conditional formatting and test a paste operation to confirm the fix.
Administrators who deployed the original KB5002934 package last month should treat the revised release as a new deployment, since the build number changed even though the KB number did not. Skipping the update is not a practical workaround, because build 16.0.5574.1006 also carries all current security updates for Excel 2016.
Microsoft has not said why the paste bug returned or what it is changing to prevent a third regression in Excel 2016.
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