You can create the user in the admin console and then log into that users webmail account. Then:
1. Goto the "Options" tab
2. Goto the "Address Book" tab
3. Part way down the page you will see the "Import" button
3. Click browse to find your .csv and then Import
You will also need to make sure that your maximum number of contacts is set appropriately to meet the needs of your .csv file. So if you are going to try importing 20K contacts you will need ensure your COS for the account will allow that many contacts.
Also I am not sure how the Import will behave with such a large contacts upload but it will be interesting.
How detailed are your contacts? Addresses, phone numbers...etc??
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Cheers,
Travis
"Let's look at this from a standpoint of "Status". What exactly, on the Space Craft, IS working?"
-Flight Control, Apollo 13
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