Haiwei mobile phone calendar can not synchronized with exchang.

Question

When Haiwei mobile phone calendar can not synchronized with outlook using exchang, it always reports username,password and Domain name mismatch. When I use outlook to fill username and password, it is pass, but it can not syncronized the calendar data. Previously the function is ok. Only when two month ago, I deleted the link and reload, the problem happend. I ask Huawai engineer and they told me to connect with your company.

Thank you in advance