Mail won't open on Mac

Re: "Mail on my Tahoe Mac won't open. Whereas its fine on other Devices."

Wondering whether your MacOS Tahoe version is up-to-date with all of the available bug-fixes and security updates:

What's new in the updates for macOS Tahoe 26 - Apple Support

Eg: says version macOS Tahoe 26.6.2 is the newest version.

If you choose to update: It is always wise to back-up your Mac first.

How to back up your Mac - Apple Support

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If your Mac is already using MacOS 26.6.2

You may want to try restarting your Mac via Apple menu > Restart

(ie: deletes temporary files, re-establishes connections, may update any recent setting changes etc., and often restores order if something is not working as expected.)

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Else: Apple support provides a troubleshooting article that may help:

See what to do: If an app on your Mac stops responding, quits unexpectedly, or won’t open - Apple Support

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Useful resource:

Mail User Guide for macOS Tahoe: Mail User Guide for Mac - Apple Support

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Apple's Mail Support website: (info, / support / contact options etc.)

Mail - Official Apple Support

Thank you kindly for your prompt reply !

Ummm ... there have been quite a number of updates between, v26.2 and the latest Tahoe : v26.6.2. If you wish: You can check for updates via Settings > General > Software Updates.

I’m using the latest Tahoe v26.2.