When you click a mailto link from a browser or from Outlook, the default sending account is the Exchange Server account instead of the IMAP account.When you have multiple accounts and an IMAP account in Outlook 2010/2013 and you change the default sending account to the IMAP account, you may experience the following issues: Both of these options are controlled by a registry key.Īlternately, you can use a macro to always open a new message with the default account selected or open a new message with a specific account selected. The obvious solution is to use a different *.pst file for the POP3 accounts but if that is not acceptable, you can set a registry value to always use the default account, regardless of the data store, or to always ask which account to use.

When the IMAP user sends a new message to a contact or starts a new message after viewing the calendar, Outlook chooses a POP3 account as the sending account. Instead of using the default IMAP account as it did in previous versions, Outlook now sends new mail using a POP3 account that is delivered to the *.pst. This feature not as well liked by users with an IMAP account as their primary account and POP3 accounts delivered to the default *.pst file.