Outlook Synchronization Errors

I have a client whose e-mail is hosted by Office 365. Employee B is an assistant to Employee A. Employee B needs access to one sub-folder in Outlook of Employee A - the folders are nested a: Inbox > Clients > Levy (Levy is the folder Employee B needs access to). I have setup the sharing as detailed in this (and similar) articles: http://www.msoutlook.info/question/access-or-share-non-default-outlook-folders

Employee B can now successfully access Employee A sub-folder, however, no Employee B is receiving the following errors about every 5-10 minutes:

8:32:07 Synchronizer Version 14.0.7160
8:32:07 Synchronizing Mailbox 'Employee B'
8:32:08 Synchronizing server changes in folder 'Employee A- Inbox'
8:32:08 Downloading from server '3c57ce1e-0582-441c-ae30-ce41ec078280@domain.com'
8:32:08 Error synchronizing folder
8:32:08 [80070005-508-80070005-560]
8:32:08 You do not have sufficient permission to perform this operation on this object.  See the folder contact or your system administrator.
8:32:08 Microsoft Exchange Information Store
8:32:08 For more information on this failure, click the URL below:
8:32:08 http://www.microsoft.com/support/prodredirect/outlook2000_us.asp?err=80070005-508-80070005-560
8:32:08 Done

I have done some research but can't figure this out.

Any thoughts?