I am right now trialing the Roadsync application on my S60 3rd edition mobile. The documentation states that it allows multiple exchange accounts to be configured and that we could switch between the those accounts from the configuration. However, it doesn't specify how to do that and I am unable to figure that out too. Do any of you have a solution?
Per the roadsync faq it appears to be a little mis-leading. What they actually mean is that you'd have to re-enter the settings (e.g. your username and password) into the RoadSync settings to 'switch between accounts'. Essentially you're re-configuring RoadSync.
You could install the latest nokia mail for exchange for your second account. I haven't tried specifically, but I do know I've had them both installed on the phone at the same time one set to Manual sync, one set to Automatic. Without syncing contacts, calendar, tasks, etc. The latest MfE supports sub-folders and HTML e-mails which is a welcome addition. I don't know what this would do for battery life, etc, however.