GetMailboxSize() is working fine but still facing problem while filter applies on the body of mail .
Another query is that, is there any method of saving mailbox data into PST file.
ExchangeFolderInfo info = client.GetFolderInfo(mailboxInfo.InboxUri);
ExchangeFolderInfoCollection fc = new ExchangeFolderInfoCollection();
client.Backup(fc, “E:\pers.pst”, BackupOptions.None);
Because this method saves only one folder at a time and i want all folders data into pst file.