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Today while working my system suddenly had a kernel panic.

I tried to restart in safe mode and the meter went to about 1/4 and no further (did this twice). Since that didn't work I restarted normally without any issues until I open and all of my accounts and mail had vanished. I even looked for the kernel panic log and couldn't find any trace of it.

Does anyone know why? Is there any possible way to get my accounts and email back?

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Click on the Finder icon, then press shift-command-g. This will open up a dialog where you can type a direct path.

Now type ~/Library/Mail/ and press return. You should be able to see a folder called something like 'V2', and possibly other folders with similarly cryptic names. Open them and look for your mail messages. If your mail messages are hidden anywhere on your computer, they will be somewhere in these folders. If they are not here, then I hope you still have access to the messages online, or have made a Time Machine backup of your computer, because they are gone from your mac.

If you have made a Time Machine backup, then keep the Finder window open and and go to the Time Machine menu and click 'Enter Time Machine'. You will be able to travel back in time through the folder looking for your messages.

If you still have the messages available online, then you should be able to setup your accounts again and re-download the messages. (If you are using IMAP, then the messages should all download automatically when the account is setup, but if you are using POP you may have to go online and change your POP download settings to allow all mail to be downloaded.

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This worked for me:

I replaced the file: library/preferences/ with a backed up version which. It is only 57kb and just has the preference account info restoring the links you need. Here is where I got the tip:

Please note: the above is for Snow Leopard -for Lion it is different -see the link.

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