Windows Live Mail Not Saving Sent Messages

I have a Windows 7 computer.  I installed WLM on it recently.  I have 3 email accounts on the WLM.  One is a POP3 and the other 2 are IMAPs.  The POP3 and one IMAP is working as it should.  However, my other IMAP does not save the sent messages.  This particular account is a squirrelmail account.  I am receiving all mail and my emails are being sent, but they are not showing up in sent mail.  All options are checked to save sent mail.  The option to store special folders on the server is also checked for this account.  Also, if I log into the actual squirrelmail website, messages that I have sent through WLM are not showing up in the sent folder on the squirrelmail site either.  This is a huge inconvenience and problem.  I have uninstalled and installed WLM several times with no luck in solving this problem.  Any help in this matter would be much appreciated!!!!