Whats the best way to Programmatically Process New Email Messages and Store Attachments - windows

Question

I have several clients/vendors that distribute reports to me via email. Some of these files are enormous, and need to be removed from email and saved on a file share for processing, as well as to control mailbox size.
Can anyone provide guidance on their recommended method of automatically downloading and saving attachments.
I am in a MS Windows Environment (Client & Server Computers). Emails are on an Microsoft Exchange 2003 Email Server.
Preferred use of Microsoft Technology for consistency across solutions (C#), however I am open to any suggestions, be it C#, VBScript, Perl, Java, Components I should purchase, etc..
Scenario
Each Day bob#whysendmereportsbyemail.com sends an email with the subject "Activity Report for YYYY-MM-DD" to me at
john#myemailaddress.com
Each Email has an attachment named "ActivityReport-YYYY-MM-DD-HH-MI-SS.xls" which I need to save on my filesystem at
"C:\FilesFromBob\ActivityReport-YYYY-MM-DD-HH-MI-SS.xls"
Thanks in advance for any assistance.

Answer 1

Exchange 2003 provides a WebDav API which you can use to access emails, contacts etc.. from a user's account.
There's a few answers about accessing a user's Exchange inbox on SO already. I've previously used this approach for almost exactly the situation you outline, and once you work out the WebDav API model and the structure of the requests and responses, it's not too difficult to extract emails and their attachments.
There are other ways to interact with Exchange 2003 (outlined on SO here), but I've only tried the WebDav approach because it seemed the most reliable.

Answer 2

I finally wrote the code to store messages from Outlook
Unfortunately this code runs from within Outlook, so Outlook has to be open.
I did not yet investigate how to schedule the run, but now its easy to do
Sub SaveOutlookFileAttachments()
Dim oStores As Outlook.Stores
Dim oStore As Outlook.Store
Dim oFolders As Outlook.Folders
Dim oFolder As Outlook.Folder
Dim destFolder As String
Dim oItems As Outlook.Items
Dim oMsg As Outlook.MailItem
Dim oAttachments As Outlook.Attachments
Dim oAttachment As Outlook.Attachment
Dim oExplorer As Outlook.Explorer
destFolder = "\\NetworkShare\OrderDetailReport\"
On Error Resume Next
Set oStores = Application.Session.Stores
For Each oStore In oStores
If oStore.DisplayName = "Inbox" Then
oFolders = oStore.GetSearchFolders
For Each oFolder In oFolders
oItems = oFolder.Items
For Each oMsg In oItems
oAttachments = oMsg.Attachments
For Each oAttachment In oAttachments
If InStr(1, oAttachment.FileName, "orderdetail_", vbTextCompare) Then
'MsgBox ("This File Needs to be Saved: " & oAttachment.FileName)
oAttachment.SaveAsFile (destFolder & oAtch.DisplayName)
End If
Next
Next
Next
End If
Next
End Sub