User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.1) Gecko/20060601 Firefox/2.0.0.1 (Ubuntu-edgy) Build Identifier: 1.5.0.9 (20061206) Today I received an email which made thunderbird a bit dizzy. The From: field from this message was: From: =?iso-8859-2?Q?Brzezi=F1ski=2C_Maciej?= <yyyy@xxxx.xx> (email address was modified to not feed spiders, but it does not matter to this bug report). The problem however is that on the list of messages (Inbox), the sender was show just "Brzesinski" while it shall be "Brzezinski Maciej". Next, hitting reply opened composition from with two recipients. One is "Brzezinski" and second is "Maciej <yyyy@xxxx.xx>". The bug seem to lurk in email parsing code as it does not matter it is From: or CC:. If this is formatted the same way, the same oddities occur. Other message headers that may help are: X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message Reproducible: Always Steps to Reproduce: 1. 2. 3.

This is a parsing bug, but it's not related to Exchange.