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Office 365 - Thunderbird (Mac) - Exporting Personal Dictionary
Thunderbird creates a file named persdict.dat where custom dictionary entries are stored. This tutorial will describe how to access this file and its contents.
Exporting Thunderbird Personal DictionaryClose Thunderbird before beginning the following steps.
Open the Finder application.
Press Shift-Command-G to open the Go to Folder window. (If you are using a Windows keyboard use the "Windows" key in place of the "Command" key.)
Type the following into the window: ~Library/Thunderbird/Profiles/
Select Go to proceed.
A window will open with your Thunderbird profile folder. Open the folder.
Navigate to the "persdict.dat" file. Copy and Paste it to your Desktop.
Using a text editor (like TextEdit), open the "persdict.dat" file saved on your Desktop. You will see your list of custom dictionary words.
In your new email client begin drafting a new message. Copy and Paste your word list from TextEdit. Run the spellchecker and add the words to your new email client's custom dictionary.