Types of Prodect key in MS and Description

Understanding Product Key Types Listed in Subscriber Downloads
 

Key Type	Description
Not Applicable	No key is needed to install this product.
Retail	This key allows multiple activations and is used for retail builds of the product.  In many cases, 10 activations are allowed per key, though often more are allowed on the same machine.
Multiple Activation	You can use the same key to activate multiple copies of the software. MAKs are generally used with Volume Licensing builds of a product.  Typically you will only be provided one MAK for a given edition of a product.
Static Activation Key	A key is required for installation of the product, but the key does not require activation, so it can be used for any number of installations.
Custom Key	This custom key provides special actions to activate or install.
VA 1.0	This is a multiple activation key.
OEM Key	This is an Original Equipment Manufacturer key that allows multiple activations.
DreamSpark Retail Key	This retail key is for DreamSpark programs and allows one activation. These keys are issued in batches.
DreamSpark Lab Key	This lab use key is for DreamSpark programs and allows multiple activations.
DreamSpark MAK Key	This is a multiple activation key for DreamSpark program customers.
DreamSpark VA 1.0	This volume license key (VA 1.0) is for DreamSpark programs and allows multiple installations.

Daily Product Key Claim Limits

What are the new daily key claim limits?
The 24-hour key claim limit is 10 for all MSDN, BizSpark, and WebsiteSpark subscriptions, with the exception of MSDN Essentials and MSDN For Action Pack (daily key claim limit of 7).
Note: key claim limits are subject to change. Please check here for the most up to date limits.
What does it mean if I reach my daily key claim limit?
Reaching your limit means that you have claimed the maximum number of keys available with for your subscription within a 24 hour period. Every 24 hours, starting at 12:01 AM PST, you may claim another set of keys, up to your subscription maximum.
How do I get more product keys?
Simply wait until 12:01 AM PST of the day following the day when you hit the key claim limit. (For example: If you hit the limit of keys that may be claimed for your subscription at 6pm on a Friday evening, wait until 12:01AM Saturday morning to claim more keys.)
Why has Microsoft limited my access to product keys?
Microsoft is committed to protecting the integrity of the MSDN Subscriptions program and the exceptional value of the software and benefits that the program’s legitimate subscribers receive for their investment. Our research shows that the majority of subscribers are covered by the number of product keys included in their subscription. Additionally, each product key has multiple activations and many products allow the customer to install and use the product without activation for 30 days or more. If you need additional keys, you can submit a request through MSDN Customer Service and it will be considered for approval on a case-by-case basis.

Activating a Product

Activation is required for certain products; generally in MSDN this is limited to Windows, Windows Server, Microsoft Office client applications, and Expression Studio. When activation is required, many products - including Windows and Office - allow you to install and use the product without activation for 30 days or more. If you re-image your computers frequently (i.e. once every 30 days), consider NOT activating the product. Product keys supplied as part of your MSDN subscription do not allow unlimited activations of a product.
If you’ve claimed all the available product keys under your subscription and have used up all the available activations, you can request additional keys by contacting your local MSDN Customer Service Center. Requests will be considered on a case-by-case basis. If approved, product keys will be accessible in Subscriber Downloads.

Exporting and Saving your Product Keys

You can export and save all your product keys from the My Product Keys page so that you don’t need to be online to access them.  You can open the XML key list using XML Notepad, Microsoft Excel, or other XML compatible programs. XML Notepad 2007 provides a simple intuitive user interface for browsing and editing XML documents, and can be downloaded from the XML Notepad 2007 page.
To open the Product Key Export using Microsoft Excel:

1. Log into Subscriber Downloads and go to the Product Keys List page.
2. Click the Export Key List to XML link.
3. Save the file to your hard disk.
4. Start Excel.  On the File menu, click Open and browse to the file you saved in step 3.
5. If a dialog box appears displaying a message about a schema not being referenced, click the OK button. You can also check the box to not see this message in the future.

For More Support call MSDN: - 18001021100  or 1800111100 and 08040103000
Microsoft Professional customer :- 18004195666

Thanks 
R.karthikeyan