The beta2TR is completely killed, nothing left.
It's surprising that [tag]Microsoft[/tag] didn't make it compatible with older version of exchange server. I would have thought it's easier for standalone PC/notebook to have [tag]Office 2007[/tag] installed as OEM software when it's launched then for enterprise to upgrade their exchange servers.
Of course I note the warning that beta shouldn't be used on production machines but without having the software used under stress during work hours how would I know if it's any good? How would Microsoft collect user experience if the beta is only used for a few minutes at night after work?