When using Outlook 2010 or earlier and having Enterprise Vault 9.x and Symantec Encryption Desktop installed, additional IMAP accounts in Outlook will not work correctly.
The account storage .pst for the IMAP account is created multiple times, mail can not be accesses in the IMAP account.
This is an incompatibility caused by both products accessing the .pst storage file.
The following are possible workarounds: