Cannot open your default e-mail folers. Microsoft Exchange is not available.Either there are network problems or the Exchange computer is down

Hello. We recently had a hardware problem on an Exchange Server. We then set up a new server and moved all the mailboxes to a the new server.However, tow of these did not go across successfully. However, somehow they are now on the new server and can be accessed via web mail.However this is not possible via Outlook and the message we get is:
Cannot start Microsoft Office Outlook. Cannot open the outlook window. the set of folders cannont be opened. You must connect to Microsoft Exchange with the current profile before you can synchronize your folders with your offiline folder file.

I have notice the following patterns.Of the 5 mailboxes that did not migrated correctly, when I try to configure a profile i get the following message:
"Cannot start Microsoft Office Outlook. Cannot open the outlook window. The set of folders cannot be opened. Microsoft Exchange is not available. either there are network problems or the exchange computer is down for maintenance."

When I create a new mailbox I am also able to access it via outlook web access but when trying to use outlook to open the mialbox I get the followin error:

"Cannot open your default e-mail folers. Microsoft Exchange is not available.Either there are network problems or the Exchange computer is down"

Also, strangely enough, I have been able to fix the problem for 3 mailboxes so far simply by moving them from one store to the other and back but this does not work for other mailboxes