10.6.5 Mail - Crazy Account Disappearing Problems on 2 machines!

My mail on my MacPro started crashing yesterday. Mail accounts (POP and Apple) disappeared. I replaced the mail.plist file and all's well, for like 5 minutes. Then one account or two would disappear, or maybe all. Then I noticed the same thing was happening on my MacBookPro, delayed, mirroring what was happening on the tower. So, some research suggested also replacing the address.plists along with the mail.plist. Which I've done now multiple times on both machines with older time machine versions from like 10 days ago. Each time all appears well, accounts show up, mail comes in, then either crashes, or one or more accounts disappear from the left menu.
HELP! Is it a virus? A Bug in recent Mac software auto upgrades?
I have to say, because its happening on two separate machines simultaneously, this is the weirdest system problem I've had in 25 years of Mac use.

Sounds like something is interrupting the housekeeping tasks in Mail, and resulting in the loss, corruption, or other of the plist.
This can happen with a sudden loss of power, or running out of space on the boot volume, even if only temporary because some other app is using the disk space.
Start on the Mac Pro, and run Verify Disk to look for possible reasons for the crash you reported. The crash of Mail could result in the loss of the plist info.
Have you any Mail plugin or enhancement app for Mail on these Macs?
Ernie

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10.6.5 Mail - Crazy Account Disappearing Problems on 2 machines!

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