EDIT 10/01/2008: To read the updated (and more comprehensive) guidance for troubleshooting errors 0x8004010f, please go here.There are a multiple reasons for why an Outlook client can receive the 0x8004010f sync error. Unfortunately, 0x8004010f is just a generic MAPI error and will show up for a variety of problems. Here is what the error looks like under err.exe (Microsoft Exchange Server Error Code Look-up Tool:(
# for hex 0x8004010f / decimal -2147221233
# 5 matches found for "0x8004010f"
This is what the error looks like from the sync log from within Outlook:
12:45:53 Synchronizing Mailbox <dgoldman>
12:45:54 Microsoft Exchange offline address book
Some of the most common reasons for Outlook clients to receive the 0x8004010f error with regards to downloading the OAB are listed below. Most of these are documented and I have linked articles to each of these to help everybody out. Please note that these solutions can change a small bit depending on unknown factors in a company's environment.