How can I configure OWA to allow people to stay logged in for a full day, instead of logging them off every 15 minutes? Thanks in advance,

Look at: "Setting the cookie authentication time-out" here: http://support.microsoft.com/kb/830827 This is for Exchange 2003. I'll verify this is also true for 2007 and post back.

Yes, it also applies to 2007. See here: How to Set the Forms-Based Authentication Public Computer Cookie Time-Out Value http://technet.microsoft.com/en-us/library/bb124787.aspx How to Set the Forms-Based Authentication Private Computer Cookie Time-Out Value http://technet.microsoft.com/en-us/library/bb124819(EXCHG.80).aspx