I am very happy to see that the Exchange team made this issue public and are working on a fix. I am also happy I did not deploy it as soon as it came out. This just goes to show that you really need to test management packs when they first come out. This doesn’t mean just looking at the console, but the application that the management pack touches, as I don’t think people who deployed this had any indication of problems until end users started to complain about mailbox access.
Anyway, let’s hope they release a fix soon, but in the meanwhile if you have deployed it then they post a work around. Here is the link to their blog with a detailed description of the issue and the work around.