There could be several reasons why Apple Mail is not opening, including a software glitch, outdated version of the operating system, corrupted mailboxes, or insufficient storage space on your Mac. Here are some troubleshooting steps you can try:
Check if there are any software updates available for your Mac and Apple Mail. Install them if available.
Restart your Mac and try opening Apple Mail again.
If the issue persists, try rebuilding the mailbox or removing and re-adding the mail account in Apple Mail.
If none of the above solutions work, you may need to contact Apple Support for further assistance.
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