I ran an HP server with SBS 2003 with multiple databases with 4GB of RAM, which as you know, means it can only use 2.7GB. I ran AC at perfect speed for weeks. Adding RAM will not help. I have forgotten who has what, but 8GB of RAM would be all you would need.
Looking at your task manager, it appears that you are using up RAM way too quickly. I think everyone here is focusing on AC because that is the program that points right back at WIN 7. Here is what I would do. In fact, I just did it since I had the inability to make email accounts.
I would assume that this is a Windows system problem. There are multiple reasons you could be having memory leaks which neither are due to SQL or AC. I would call Microsoft Support, pay them $258 and let them fix it. They don't charge you if they don't fix it. And, if there is a problem with the computer or OS, they WILL find it. You need to see patients and not troubleshoot AC. Besides, there is nothing more fun than watching them do their thing on your computer screen.
