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Programmatically changing Mail Settings in MS Outlook. MSDN says: "The Outlook object model provides all of the functionality necessary to manipulate data stored in Outlook folders. However, there is limited functionality available to control Outlook itself. For example, there is no programming method to change the Options settings on the Tools menu, in Outlook via the object model".
So we'll have to change some registry settings. Outlook creates these settings in the registry after first start with a specified profile. After this we can take a control over it.

This article is dedicated to enabling and disabling transports in Options/Mail Services/Mail options/Check for new mail on.

The path to keys that we'll need depends on operating system version.
For Windows 95:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\Windows Messaging Subsystem\Profiles\<Profile Name>\0a0d020000000000c000000000000046
For Windows 98/ME:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows Messaging Subsystem\Profiles\<Profile Name>\0a0d020000000000c000000000000046
For Windows 2000/NT:
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem\Profiles\<Profile Name>\0a0d020000000000c000000000000046
Now these keys are keeping what we need: "10030239" and "101e0250"
10030239 contains information on whether a transport is checked/unchecked. For each transport there is a four byte value contained 1 in first byte.
For example a value: 01 00 00 00 00 00 00 00 01 00 00 00 means that first and third transports are enabled (checked) and the second one is disabled (unchecked).
Of course what a sense to change these values if you don't know what transport belongs to each four byte value. That the 101e0250 key is for. It contains header with 12 bytes, the first bytes shows the number of transports. Since 13-th byte the key contains an array of strings (C-style, each finished with 0) with transport names as they are shown in the Outlook Mail Options.
So the algorithm of enabling/disabling transports is as follows:
- Find a list of transports for a profile (and specified service for example). Read my articles about profiles programming to learn how to get a table with specified properties. In this case use PR_RESOURCE_TYPE, it should be equal to 36 for transport provider.
- Find the desired transport name in the 101e0250 key and remember its position number.
- Change iPosition*4 byte to 1 or 0 according to what you need.
- That's it. Start the Outlook and see the result.


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