Outlook 2010 "cannot display this view" on mapi message store

[Paul-Jan Pauptit]

Our message store (that is working just fine on Outlook 2003 - 2007) has a
problem with the Outlook 2010 beta. Browsing the folder hierarchy itself
works fine, but actually clicking on any folder results in a very
minimalistic

"Outlook cannot display this view"

error message. I am guessing this error is not related to views at all (this
implementation doesn't actually do anything with views), and is just a
generic error message meaning something is wrong with the properties of the
folder or the contents table.

Any suggestions on where to start looking?

(A quick browse through the log tells me the content table _is_ requested,
advised... then a whole bunch of properties are requested from the folder,
interlaced with some queryInterfaces... then the store and contents table are
unadvised, then the table is destroyed. No methods from the table are called.
That's probably telling.)

[Paul-Jan Pauptit]

As a little additional info, after requesting for the contents table, Outlook
2007 then asks the folder to map some named properties (getIDsFromNames),
then sets columns on the contents table.

Outlook 2010 does neither. What could be a reason Outlook doesn't ask for
named properties? It does require the storetypeprivate and crawlsupport
properties from the store a couple of types, but other then that the log
shows no requests for IDs.

[Paul-Jan Pauptit]

Adding STORE_CATEGORIZE_OK to the STORE_SUPPORT_MASK seems to have done the
trick. By default, Outlook 2010 wants to categorize by conversion. Our
message store still doesn't like that much, but at least now I can manually
switch to a different sort, and then the contents table shows up fine.