One of the new items introduced in version 4.0 is a wrapper for the Email configuration provider. This provides a one-stop-shop to access and modify email account settings. This is used for all email account types except for Exchange synchronisation. Each account is identified by a unique Guid so to work with account settings you'll need to know this. This is exposed through a property of the EmailAccount object, for example the following code loops through all available EmailAccounts for which there is a unique ID (excludes the Exchange account).

foreach(EmailAccount ea in os.EmailAccounts) 
{
   if(ea.Properties[AccountProperty.UniqueStoreID] != null)
   {
      //has a valid id
   }
}

The UniqueStoreID is a Guid property and so can be cast to the Guid type (the Properties collection returns items of type object because it caters for all different types of properties).

Guid g = (Guid)ea.Properties[AccountProperty.UniqueStoreID];

The EmailAccountConfiguration class is located in InTheHand.WindowsMobile.Configuration.dll in the InTheHand.WindowsMobile.Configuration.Providers namespace. A new instance is created by passing the Guid into the constructor:-

InTheHand.WindowsMobile.Configuration.Providers.EmailAccountConfiguration eac = new InTheHand.WindowsMobile.Configuration.Providers.EmailAccountConfiguration(g);

Once created you have access to a number of properties which describe the account, you can change any of these and push your changes by calling the Update() method. Properties available include the incoming and outgoing servers, the ServiceType - either "POP3" or "IMAP4", DownloadDays (number of past days to download) and many more. The documentation for the class is available in the online library