What still confuses me is that the live account is working and Ron his hotmail is working again, yet mine isn't. Is everyone connected to a different server then?
There could be two issues here (and I am speculating based on the general knowledge of how this type of infrastructure is usually set up):
1. The "front" servers (IMAP or SMTP) that your app is connecting to: There is a "farm" of them, the connection is rotated (i.e. each connection could be happening to a different server). In this case, - since Aquamail's connection for each of your account is individual, - it can be connecting to two different servers. If some of them are malfunctioning, you can experience problems.
2. The "back" servers, that store the information about your account login. These are liikely different for different accounts (and especially for different domains, such as live, hotmail, outlook ..) And they are definitely different for different countries from which they were created (e.g. live.nl and live.com ) Also, accounts created at different times could be stored in different parts of the database (and on different servers).
In this case, I suspect it is the back-servers (2) that are having some problems, and that's why you have problems with one and not the other account. (And that's why Ron no longer has a problem, but you still do.)