More Than 8 Tabs on a Microsoft CRM Form

http://www.unitek.com/training/microsoft/crm/blog/2008/12/15/more-than-8-tabs-on-a-microsoft-crm-form/

In: C:\Program Files\Microsoft CRM Server\CRMWeb\Tools\FormEditor find your formeditor.aspx and select “edit.” Find the JavaScript variable “_iMaxTabs” and notice that it is set to 8. Change the value to your desired limitation, save and close, reset IIS and you should then be able to create the additional tabs needed from within the forms customization area.

or in my case: F:\inetpub\crmroot\Tools\FormEditor\formeditor.aspx

Note: this is unsupported.