Mail updating cache directory
The App Data folder is folder is a hidden folder; to show hidden folders, open a Windows Explorer window and choose "Organize → Folder and Search Options → Folder Options → View (tab) → Show hidden files and folders".Every Thunderbird (or Sea Monkey) profile will have an "abook.mab" file, even if you've configured it to store messages outside of the profile.
It's typically called "smart mailboxes -1" Precompiled startup cache stored in a startup Cache.4.little file.If you sometimes want to use some of the disabled features when using a broadband connection consider using two profiles which use common directories outside of the profile to store the messages.One profile would disable features as described below. That way depending upon which Thunderbird shortcut you use you can easily switch configurations with minimal side effects.You can access Gmail even when you're offline, and even unsend Gmail Offline messages.The way it works is by caching your data locally so that even without a connection, your last-downloaded mail will still load and give you a page to draft new messages.
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However, the profile switcher extension will let you switch profiles.