There is no support in email protocols (POP, IMAP & SMTP) for changing passwords, so no email client using these protocols can do this. it may be possible with an Exchange/Outlook combination, but they don't use these standard protocols. In my work environment, the system username/password pair which gains me access to my pc and the company servers also opens up my email account. If you'r using regular email protocols, then this is a job that needs to be performed either by an administrator, or via an interface (such as a web page) that supports such administrative functions. If it's a "corporate" account then I would expect there to be an IT department who should look after these matters.