Sorry for saying this but SalesInbox is a really mess. BIG FAIL. Bad UX and VERY bad IMAP sync. I don't know how can someone use this to be more productive. It's just the oposite.
I'm trying to use SalesInbox for a while but sales people do not have just sales activities so we still have to came back to the mail app anyway. Folders of SalesInbox are not in sync with folders of mail server (wich syncs Ok to mobile) and vice-versa wich leads to double work as now you have to cleanup 3 inboxes (Mail Inbox folder + SalesInbox Inbox folder + SalesInbox Mine folder). Also too much clicks just to do simples tasks when using SalesInbox.
Zoho MUST rethink this product from zero with a REAL mail sync and a much better UX. If we had to switch back all the time to mail app for any simple task like move a mail from the mail server Inbox then the product is not working as it should be.