Howdy, I'm testing Exchange 2003 SP1 in our lab and have found the following issues. After applying the service pack, if you already have the ADC installed, you must reinstall it from the adc\i386 folder the service pack extraction creates. I also found that I had to delete my existing connection agreements and run the connection agreement wizard again to recreate them before the Exchange 5.5->2003 mailbox move feature would work. Additionally, when attempting to move a mailbox across administrative boundaries (yea, finally!), I'm getting a message stating that I can't do it until the Exchange 5.5 server has the "DS/IS Knowledge Consistency Adjuster Patch." Well, I've searched high and low, and cannot find any patch relating to the DS/IS KCC, and of course, the wizard provided "help" that points to a generic Exchange page on www.microsoft.com. If anyone can point me in the right direction on this one, I'd appreciate it. Greg