When I do a search (ctrl+K) and type in an email address, an email comes that I deleted and references the contact I also deleted.
The email shows upon the screen as found for this email address but the email is not really there and shows that there was a jpg file attached. How does this email show up and it is not really on my pc anymore as I deleted it? I also deleted the contact from the address book.
Keazen oplossing
On the toolbar 
> Help > Troubleshooting Information
Click the show profile button in Troubleshooting Information Close Thunderbird In the file window that opened, delete the file global- messages-db.sqlite Restart Thunderbird.
The search will be rubbish until the file fully regenerates, which could take a whole day if you have 10 or 20Gb of mail. You can monitor the status of that using the Activity Manager.
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Keazen oplossing
On the toolbar > Help > Troubleshooting Information
Click the show profile button in Troubleshooting Information Close Thunderbird In the file window that opened, delete the file global- messages-db.sqlite Restart Thunderbird.
The search will be rubbish until the file fully regenerates, which could take a whole day if you have 10 or 20Gb of mail. You can monitor the status of that using the Activity Manager.
I am unable to delete addresses in <ctrl+k> When I opened the file window but it does not show global- messages-db.sqlite.
Thank you
thank you
so what part of my instruction did you not understand. because I really have no idea what you did. But I do know hat Ctrl+K was not part of them, or anything to do with using search in Thunderbird.