[IMP 2.2] If your organization's installation of IMP supports password changes over the Web, you will see a Change Password link in IMP's menu. Click on that link in order to change your mail password. If that link does not appear in the menu, your support staff will be able to inform you of password-change procedure at your site.
[IMP 3.x/4.x] If your organization's installation of Horde and/or IMP supports password changes over the Web, you will see a Password link in Horde's and/or IMP's menu bar. Click on that link in order to change your mail password. If that link does not appear in the menu, your support staff will be able to inform you of password-change procedure at your site.