Вот что нашел...
The biggest problem with the new Outlook client, and it is a big problem, is that synchronization causes Outlook to crash and restart. This is extremely annoying, especially if you are working on an e-mail when it restarts as you are likely to lose the entire message! Apparently the problem is caused by the existence of dates in the Birthday or Anniversary fields in the Contact record that are before 1970. I guess CRM 4.0 doesn't like Geezers. Microsoft is aware of the problem and is working on a fix. Unfortunately removing those dates from your data doesn't seem to help. The workaround is to not enable synchronization. Hopefully Microsoft will have their hotfix out soon.
http://ts2community.com/blogs/larryl...ok-client.aspx
говорят что этот хотфикс должен помочь, но думаю нифига не так это
http://support.microsoft.com/kb/948045
а можно просто стереть или поменять дни рождения на другое время.