Exchange 2007 OWA not working right after 2010 CAS install

I just added new Exchange 2010 CAS/HUB servers. They redirect users that have 2007 mailboxes to my 2007 CAS servers but you can only stay logged in for a couple seconds and users keep getting booted out. I switched DNS and URLS back to see if things worked the way they used to. Things are still not working right. I can log in but cant stay logged in without getting redirected to the log in screen.
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j_pearcyConnect With a Mentor Author Commented:
problem was actually with a piece of network gear. I am however having issues with SMTP now. Getting 530 5.7.1 Client was not authenticated when trying to send mail to internal users from the outside. Yes I have anonymous users box checked on default receive connector under permission groups.

IE6 will only get the light experience no matter what. CAS 2010 can only open 2010 mailboxes; it cannot connect to 2003 and 2007 mailboxes. The only time CAS2010 will do anything OWA related with 2007 is if the user's mailbox lives in a non-internet facing AD site and only has CAS2007 boxes in that AD site. When this happens the CAS2010 box in the Internet facing AD site will proxy to CAS2007, which in turn opens the 2007 mailbox. In this one particular case you'll have to copy the CAS2007 binaries to the CAS2010 server for this to work.
j_pearcyAuthor Commented:
found the solution on my own
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