I  write/send/receive all emails in WLM. These emails then transmit from/to my PC in Yahoo (BT is my ISP). Regularly WLM and Yahoo fail to 'talk'  and no emails send or receive in WLM (even though Yahoo works correctly and my emails do send from/arrive in it). BT has frequently checked my system, confirm its service is working correctly and the fault is a Microsoft issue. Advice, please.

[Original subject: Windows Live Mail]