I have upgraded to the 8100 and can not get my Outlook database to sync for my 400 contacts. Calendar works fine - but I get the error message of "unable to write or update application"

Any help??

I had the same problem with a customer's 8100. I went into his outlook contacts and he had not deleted the pre installed "welcome to contacts". It is the first address that is saved on the list. At the same time I deleted his only distribution list. The problem went away and it sync’s fine.
Other blackberry's will not sync if you have pic's stored to the contacts.

Hope that helps.

I had the same problem. Solved with your help by deleting that first blank contact inb Outlook. Thanks!!