I'm having this problem as well. I bought my Transformer last week. I've already installed 3.1 on my tablet. I tried to add my exchange account to the stock e-mail client, using a manual setup (in both versions). For some reason however I don't seem to be able to connect to our Exchange server. The error message that I'm getting is: This server requires security features your android device does not support.
I know this was a problem with older versions of Android. But starting with 2.2 these issues should have been solved. Also, some colleagues of mine own 2.2 and 2.3 devices. And they can connect to our Exchange Server without any problems. Unfortunately I can't with my brandnew Transformer .
I've installed Touchdown for Tablets. This app has no problems whatsoever. But I'd much rather use the stock e-mail client, because it lets me read my mail from all my e-mail accounts in one tool.
The security policies Touchdown lists as being requested from our Exchange server are the following:
?allow simple password: No
?Password/PIN required
?Failed Attempts 8
?Min Length 4
?Timeout 600 sec.
?Password recovery
I have sent in a bug report at code.google.com. Its Defect Id is 17987. Perhaps others out there with a honeycomb tablet who are having this problem as well, could leave a message there: http://code.google.com/p/android/issues/detail?id=17987.
Regards, Perenor