This tutorial assumes you've already logged in to RoundCube webmail
Now let's learn how to search for specific email messages
1) This is the search box. Enter a term you wish to search for, then press <enter>

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RoundCube searched all messages in the Inbox for the word "jim" and found one match

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You can just as easily search for messages in other folders

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RoundCube found one match in the Sent folder

2) To clear the search box, click the X icon here

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This is the end of the tutorial. You now know how to search for messages in RoundCube