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cannot connect thunderbird to mail

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After most recent update to thunderbird I have no email or email accounts when I boot TB. The profiles is in default location and mail (2.58 GB) is there but it does not show up when I start TB ? ? ? Curiously the address book is there . . . seems like TB is not recognizing my profile/mail data. Help!

After most recent update to thunderbird I have no email or email accounts when I boot TB. The profiles is in default location and mail (2.58 GB) is there but it does not show up when I start TB ? ? ? Curiously the address book is there . . . seems like TB is not recognizing my profile/mail data. Help!

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Do you use CCleaner?

Are the affected accounts with gmail?

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Yes to CCleaner, but all accounts are Comcast accts.

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CCleaner is KNOWN to with IT'S recent update mess with profile folders and settings. If you have a backup of those settings revert to them WITH CCleaner set to NOT MESS with anything Thunderbird, as it already has it's own built-in cleaning mechanism

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OK, and if I don't have a backup?