Google apps already autocompletes on the employee list: http://www.google.com/support/a/bin/answer.py?hl=en&answer=1092941 http://www.google.com/support/a/bin/a

Google apps already autocompletes on the employee list: http://www.google.com/support/a/bin/answer.py?hl=en&answer=1092941 http://www.google.com/support/a/bin/answer.py?hl=en&answ... The personal contacts is another thing. So having 10k or more employees isn't a problem for google apps, what is a problem is employees who have more than 10k personal contacts (not very common).