Why should I use the ADC Tools to create my Connection Agreements?

Martin -

You should definitely continue to stop the ADC when you're doing moves WITHIN the site. Cross-site mailbox moves require the ADC, and in these moves there's no need to stop the ADC.

That said, you CAN stop the ADC -- and if you're combining moves within the site and across sites, you should stop the ADC during the process to ensure the moves within the site are not affected. The mailboxes moved cross-site will simply not complete their cleanup until the ADC is reenabled and the cleanup cycle completes. See my blog post for more on the steps in this process: http://blogs.technet.com/evand/archive/2004/09/05/225918.aspx