So What Exctly Are The Limits On A Google Adwords Account (Campaigns, Ad Groups, Keywords)

Here is an email from Google Adwords Support:-

The AdWords account structure has 3 levels – campaigns, ad groups
and ads.
You can have up to 100 ad groups in a campaign and up to 25
campaigns in
an AdWords account. In each ad group, you can have up to 50 ads of any
format and up to 2000 keywords.

This seems to be the official line from Google.  It is also wrong.  I have more than one account where I have a lot more than 100 Ad Groups in a campaign.

At any rate, if you do run out of space, and get an unhelpful error message saying that you exceeded your limits, then just send an email to

adwords-uk@google.com

They seem to be fairly quick in increasing your limits when you need them too!