My exchange email not working and some of my phone contacts missing

Hi,

My exchange account is saying "cannot send mail" and "an error has occurred while delivering this message". Then it asks for a password and tells me my password is incorrect when it most definitely is not incorrect.

I also seem to have lost recent contacts in my phone, not all.

This happened before and EVENTUALLY after about a month, my password worked.

Please don't ask me to delete my account and download it again - this doesn't work.

Very frustrating.

Thanks

Marcus