I have always had my mail setup like this.
Main account is a work Exchange Mail Box Second account is a personal gmail account. I always had it configured so that mail received from account 2 (gmail) was delivered into the exchange mail box. This allows it to sync the entire mail set between computers, access it from exchange webmail and most importantly only have one inbox / sent items etc.
Additionally when configured this way, when sending a mail, underneath the send button you would get to pick which account your sending from.
But I cant configure this using Outlook 2010. I dont know why. I used to be able to select to deliver the mail into the exchange box. But now I can pick a pst, but if I pick the Exchange ost, it says its not a valid pst.
I would really love to continue to run it like this, can someone assist me as to why this is no longer available.