outlook 2011 not downloading mail

We bought and installed MS Office 2011 on new MacBook Air.

I configured exchange account on Outlook 2011 .

But I found a problem, it will not download any new email after 124835 items. 

It always shows "Inbox : Updating local".

Secondly, I checked other sub-local folders are OK. It shows "This folder is up to date".

I right-click the Indox, the size of inbox is 17303242K(without sub-folder).

Is there any limitation on the outlook file size?

Remarks:Our exchange server is Exchange 2007

Thanks,

William Wong