If your Mac is still running macOS 11, there’s a software update you need. Apple released macOS Big Sur 11.6.7 to fix an email bug that prevents email applications from opening attachments.
The new version is available to download now.
macOS 11.6.7 is out for those still surfing Big Sur
Apple unveiled macOS 13 Ventura this week, and macOS 12 Monterey came out in 2021, so macOS 11 Big Sur is from 2020. But Cupertino continues to support older versions of its operating systems, and that includes the occasional bug fix.
The official release notes for the new version say, “macOS Big Sur 11.6.7 fixes an issue where Mail and apps, such as Microsoft Outlook, cannot open attachments if the app required to open the file is already running.”
The bug was apparently introduced in version 11.6.6, which came out in May 2022.
How to update macOS
Anyone still running macOS Big Sur can download this patch now. Go to Apple menu > About This Mac. Then click Software Update. Alternatively, you can install the new version from the App Store.