1. It often doesn't see an update (never for Hotfix)
2. If it does, you don't want users applying it in a muti-user environment till all users can be updated
As a suggestion, when the user does an ACT! Update, and if a later build (update, service pack or hotfix) is available, it should just bring up a dialog that an update is available with a note that users in a muti-user database should speak to their admin as all systems need to be at the same version. Then, if they OK the message, it takes them to the downloads page specific for their country and version of ACT!
Additionally, if an admin updates the server, when a LAN users connects to the database or sync user attempts to sync, it should detect the later build and provide a link to download the same update applied on the server.
Even better, it should allow the admin to point update requests to a specific folder on their server... ACT! should chek there for ACT! Update and check their first for and updated database, then (if the update not in the folder or they can't access it) go to the web to pull it down
I think changes like this would make life much easier for admins, users and support