After see some document I know what a ribbon is, forgive my innocent.
Now i have a question, since my codes wrote under outlook2003 which not
support ribbon. But i want to maintain only one project. What should i do
with IRibbonExtensibility interface, when outlook is 2007 it can take effect,
and 2003 ignore the interface?

Ken Slovak - [MVP - Outlook] wrote:
You would need to create two separate toolbars. There are no rows in
toolbars (CommandBar objects).

If this is for Inspector UI you really should be handling the ribbon instead
of creating button/toolbar UI if you discover at runtime that the code is
running under Outlook 2007.

I create a toolbar with 8 buttons, in outlook2007 it display in one row, it
is too long, how to set them in two rows, 4 buttons each row? which
property
or interface etc. And i don't want to make outlook2003 not work, in
outlook2003, 2003 seems all button is in one row, Thank you.

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