Set Public Folder Posting Size Limit
When Outlook Web Access users post items to your organization's public folders, the posts are saved on the computer running Exchange in a temporary location, a folder called OWAScratchPad. The default maximum size for any item stored in this folder is 1024 kilobytes (KB). This means Outlook Web Access users cannot post any item larger than 1024 KB to a public folder.
Use the following procedure to change this limit. Increasing the size limit will allow Outlook Web Access users to post larger items to public folders, while decreasing the size limit will prevent Outlook Web Access users from posting any item that is larger than the limit you set.
Note The OWA Scratch Pad limit only applies to items posted to public folders through Outlook Web Access. The limit you set here will not apply to items posted through Outlook, NNTP, or other means.
To configure the size limit for Outlook Web Access public folder postings:
Note GUID is the