Now that MSN is officially running their own ads instead of Yahoo's, its time to start investing more time into adCenter. I was playing around with their bulk upload tool today and came across a keyword limitation of 10,000 keywords per "order". MSN adCenter works under the idea of Clients, Accounts, Campaigns, and Orders. Each company that sets up an account is considered a Client. When you login to your client, you have the ability to setup multiple accounts with separate billing information etc... (This is great for agencies).

Each Client can have a maximum of 10,000 accounts associated with it.

Under each account you can setup campaigns for your different products, services, or companies that you are promoting. Each account can have 10,000 campaigns.

Once you create a campaign you can associate 100 orders to a campaign. An order is a request for advertising, and each order contains your keywords and ads. Each order can only have 10,000 keywords, which means a single campaign can only have a maximum of 1 Million Keywords (10,000 keywords x 100 Orders). So if you have a really large lists, you will need to create multiple orders and possibly multiple campaigns to support your efforts.

When you add it all up though, you should be able to support a lot of keywords. 1 Million per Campaign, 10 Billion per Account, and 100 Trillion per Client. Not bad.

Managing a lot of keywords through the adCenter interface looks like it could be a nightmare though, with only 100 keywords showing at a time through the editing interface.

It's clunky but it's a good start.