
Most of the times, In MS Outlook 2010, it happens automatically when user sent message for first time. Once the Sent Items folder is successfully added, the next step is to assign Sent Item Folder. Click on Sent Items folder and click on Ok.In the tab, select the Save Sent Items… option.Enter the name of the folder- Sent Items and click on Ok.Choose the Sent Items tab in the Internet E-mail settings dialog box.In the Change Account dialog box, click on More Settings option.In the Account Settings dialog box, select the mail tab and double click on the IMAP account.In IMAP account, click on File option and after that double click on the Account Settings.For doing this, follow the below-mentioned procedure:

The only option now is to assign the Sent Items manually.

However, in previous versions, users had to add Sent Items folder in Outlook manually. MS Outlook 2010 has an enhancement feature, in which IMAP automatically tries to assign the correct sent item folders for user's account.

Sent Item Folder is a folder, which contains messages, that user Sends including replies and forwards to other people. The protocol enables generating a copy of a large number of email folders from the mail server to the local machine. It saves time because users can view the headers of the email messages and work on them as usual. Internet Message Access Protocol (IMAP) is a protocol, which allows user to access message folders from the mail server without downloading them.
