You seem to be worried that writing to part of a structure somehow "dirties" the rest so it's no longer thread-safe. That's not how it works, a structure is really just some data laid out contiguously ...

I need to finish up a console app that grabs and processes emails. I was using System.timer to loop the mail retrieval like every 10 minutes, but, due to what I have to deal with server-side, the ...