MSN http in Outlook

Hi all,

Since installing Vista I've been unable to successfully download the
messages from MSN account. I see the headers and on very rare occassions a
message may actually download.

Previously I was able to make the MSN account the default/primary account,
in fact if I recall correctly it was not using a pst file. It created an ost
file. Now I have to have a corresponding pst file and have lost the ability
(or fail to recall how) to create an ost file (I still have a backed up copy
of it).

What is required to ensure mail messages can be downloaded, besides the
obvious "Mark for download and process".

Thanks in advance,

Shaun