Aandy,
We had to remove this option due to the performance problem and make it more "idiot-proof". On some installations that we manage some users had it setup to be default perspective. You can imagine that even with 10 active users and each user having just several meetings on the calendar this was a huge problem. On installations with 500 users system simply crashed.
As a result we decided that:
- show all users in perspective was removed (while it is possible to construct a preset with all users this requires some effort)
- the default perspective is always "My Records"