multiple mail account allowable?

I'am having a survey to many webmail server but only OGO seems to give the real integration among contacts/calendar/tasks and electronic mail;

a possible trouble come from mail...

are multiple mail accounts (fetched from different IMAP) allowable? it would be so uncomfortable not to give my users the chance to manage all e-mail stuffs from one account!!

 

please answer so I can make a choice

 

a not-so bastard system adminstrator 

 

thanks in advance

 

Nico