right click the folder, select properties and then the folder to search. Manually update it to your new account.

LeoJoy said

Thunderbird successfully displays all of my e-mail accounts in the list of accounts and displays all of the inboxes correctly however it doesn't display the e-mails at my newest address in the unified inbox. To see them, I have to click on that particular e-mail accounts inbox. In every way, this account appears to be set up the same as the all the other ones. The newest e-mail account is a second account through Zoho. What do you think is the problem? Mac OS 10.9 Thunderbird 31.6 leojoy@zoho.com

Thank you. I had to select the search from the menu instead og by right clicking but it worked just the same.