Exchange 2010 SP3 on Server2008R2, Outlook 2007 & 2013 on Win7/Win8
Now have a number of staff that receive the message "You do not have sufficient permission to perform this operation on this object" when trying to open an attachment to a message stored in a Public Folder. But less than 10% of users have the error.
I have looked at a number of forums with this error but cant determine a solution as in our situation, permissions dont appear to be the issue as if the message is closed (but not outlook), and immediately reopened, the attachments can be viewed without error. More like a caching issue. Public folder caching generally turned off in Outlook account setting. Viewing message attachments via OWA has no problems.
All staff have read full details , create item and folder permissions. But not edit or Delete on the folders.
Having said that, if i give myself Editor rights, the problem appears to be less. But delete permissions are not suitable for general use and the issue has only arisen in the last 6-8 weeks. Perhaps since an Exchange update over the xmas maintenance period.