Problem using Outlook 2010 with multiples accounts

Problem using Outlook 2010 with multiples accounts

Hi,

My client have problems using outlook 2010 with multiples accounts of zoho mail @hisdomain.com
There are aprox. 15 accounts, and outlook work very slooow, and have problems with headers of mails, I mean, when recibe a mail from example@mail.com, and want answer, outlook put exampleanother@mail.com to anser mail, but exampleanother@mail.com is a mail account of another client, no is a header with response to this mail.... is a outlook - zoho problems

Any idea or solutions?

Thanks!