When an appointment is accepted on an iPhone, the status is not updated in Outlook. Conversely, when an appointment is accepted in Outlook, the status is not updated on the iPhone.

(This behavior was reported to me after server 5.0.18 upgrade. None of our dozen or more iPhone users reported this issue prior to 5.0.18.)

An appointment invitation is sent to me. I accept it on my iPhone.

- iPhone (either 3.0 or 3.0.1) shows the status as Accepted
- Outlook (either 5.0.16 or 5.0.18) incorrectly shows the status as Tentative
- web client shows the status as Accepted

A second appointment invitation is sent to me. I accept it in Outlook.

- iPhone incorrectly shows the status as Tentative
- Outlook shows the status as Accepted
- web client shows the status as Accepted

A third appointment invitation is sent to me. I accept it in the web client.

- iPhone, Outlook, and web client each show the status as Accepted

I can supply logs, if helpful. Thanks.