Mailbox choice list too long for screen, no buttons, no scrolling
Binary package hint: evolution-mapi
After entering authentication details (username, password, domain) in the authentication dialogue, a selection list of possible mailboxes will appear, if your user name is part of more than one displayname (which is obviously being used for finding a user's mailbox instead of samaccountnames) in the AD. If this list is longer than about ~40 items (might depend on font size, not verified), the list simply has no end, no scroll bars, and no (visible) buttons.
The user name is "mic", but we have around ~120 "Michael"s in the company. The list is larger than the screen and a choice cannot be made if the actual user's display name happens to be below the screen bottom.