Outlook 2003 busy meeting showed tentative ( exchange 2007 SP1)

[janx4]

Hi,

We have Exchange 2007 SP1 server. Public folders are used because we
have legacy clients.
Clients are Outlook 2003 SP3
Room mailbox is defined automatically accepts/declines meeting
requests.

When User A is making a meeting request he selects User B as a
required user and Meeting room as a resource.
Send...
Gets responses that Meeting Room(automatically) and User B(manually)
has accepted the meeting request.
Since then..everything seems to be fine..
BUT, if User A is going to his calendar and opens up his newly created
meeting, he sees under Scheduling tab
that User B time schedule is marked as TENTATIVE

Schedule Free/Busy timing is not related, because he sees the same
TENTATIVE graph days after the User B has accepted the meeting.
Also, User B calendar is showing up that the meeting time is marked as
BUSY.
And if User A is looking his meeting trough Outlook Web Access he sees
that User B is BUSY as it should be.
Why does the Outlook 2003 calendar shows that User B grap is
TENTATIVE ??

So, does anyone have an idea, what's wrong?

rgds
Sven