I'm having what appears to be a redirect loop for just one user (that I know of) in owa.
This happens for the same user on multiple machines, both inside and outside of the local network.
cpu will sit at 1% or so on the exchange server and very low on the user's system until I log in with the user's credentials. Then it will jump to 30% on both processors of both machines. It will stay that way until I reset IIS or close the owa window at which time all goes back to normal percentages.
We have recently completed a conversion from Exchange 2003 to 2010 and this particular user was disabled before the move and re-enabled and moved to a new department just today.
In the shell, I set the mailbox language to en-US per one post I read, but that didn't seem to help.