Helpful Link: Extracting Attachments from Outlook Mailboxes using C#
Article Title :
Extracting Attachments from Outlook Mailboxes using C#
This is article is written by matthewproctor. This article contains a C# code and guidelines for extraction attachments from Outlook mailboxes which actually reduces the file size of PST. matthewproctor have tested this code on mailboxes hosted with an on-premises Exchange 2013 environment, Office 365 and a POP3/IMAP mailbox.