The Thunderbird client uses its own Trash folder, not the Zarafa "Deleted Items" folder. This can be changed by editing the prefs.js profile file. See this Mozilla how-to [http://kb.mozillazine.org/IMAP_Trash_folder] for details.
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SME and Zarafa use different folder naming.
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drafts > Drafts
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sent-mail > Sent Items
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trash > Deleted Items
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junkmail > Junk E-mail
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=====Thunderbird=====
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The Thunderbird client uses its own Trash folder, not the Zarafa "Deleted Items" folder,
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Change in the config editor
Preferences > advance > config editor > find mail.server number > new string as below
Preferences > advance > config editor > find mail.server number > new string as below