icelag,
To help troubleshoot these errors, can you answer some questions about your account #2;
1. Is the email address of account 2 the Primary email address of the mailbox? Not an alias.
2. Is the mailbox of account 2 the same mailbox of account 1?
3. When configuring the account 2 as an Exchange account, can you manually set it up? This requires the server location, proxy server information, as well as user credentials to build the profile.
4. have you confirmed Account 2 is an exchange ready mailbox?
Keep me posted.