Calendar Compatibility Mode & proposing new time between Outlook/Exchange 2003

Hi, I’m using the new Calendar Compatibility mode in Notes 8.5 using the $CSCompatibilityMode=3 ini setting and testing meeting invites across the Internet with an Outlook/Exchange 2003 user.

If I send an invite and the Outlook user proposes a new time, I get a Tentative acceptance email back instead of a Countered one and I don’t see the Accept Counter or Decline Counter buttons.

The email includes the following text:

user@domain.com has tentatively accepted this meeting invitation

New time and date


New Meeting Time Proposed:

Friday, March 20, 2009 4:00 PM-4:30 PM (GMT-06:00) Central Time (US & Canada).

My question is should proposing a new time work between these 2 mail servers or do we have something setup incorrectly? Thanks very much…

Subject: Coexistence

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