"Drain stopping" an Exchange 2010 CAS array w/o user getting prompts.

Wow... thank you for the VERY quick reply and for your help.

Thank you for clarifying that the MAPI sessions have to stay with the current node until it ends correctly, otherwise the client will get a prompt when reconnecting to a CAS member.

With persistence profile timeout setting of 8 hours, shouldn't all connections to the CAS member be removed 8 hours after putting the node into a Disabled state? We would be fine with an 8 hour delay, but even 24 hours after disabling a node we still saw connections to it which made no sense to us.

Or should be using the "Force Offline" versus "Disabled", and if so should the "Force Offline" cause users to get a prompt as long as we wait 8 hours after selecting it?

What is the side effect of deleting the persistence records? I.E. Will it cause any Outlook MAPI prompts?

Thanks again for your help!