All of this might sound like I’m complaining but I’m really not.I use site mailboxes for projects on a daily basis.
However, when an item is added through Outlook, Exchange attempts to publish it to Share Point through the background synchronization process and the attempt will be rejected.
This might come as a surprise to the end user, so Exchange sends them a note (with the offending document attached) to let them know that a problem has arisen.
The solution was simple – revert to computer problem solving 101 and reboot the PC.
After the reboot all was well and synchronization worked as expected.
Finally, I have run into an issue where Outlook displayed all the contents of the site mailboxes but not using the normal document-centric view for items in document libraries.