I understand where John is coming from. But, I do think AC could support 8 users. It would be borderline SQL Express, but if you had a 64-bit server and upgraded to SQL Server Work Edition or Express, it would be able to use a lot more memory. I don't see what is inherent about AC as far as amount of users.
I think those with a lot of users who complain about issues with speed on here are those who concentrate 100% on SQL and do not have a sound 1GB, Cat5e or Cat6 network that is configured perfectly to begin with.
Most of the work with AC is going to be with queries of the SQL database. I think SQL should be able to handled multiple queries if it is in the 8 or 12 range. If you hire someone to set up your network (properly) and talk with a SQL guru from the start who can set it up properly and configure your page file on the server, etc. I think you will be fine.
