Legally Yours, an impressive blog site edited by Rahul Jindal, displays the results of a survey. The 287 respondents, of undisclosed source, answered the question, “Which service are you outsourcing/considering to outsource/supporting?” [Not the optimal phrasing for a question if you want crisp metrics, but set that aside.]
Legal Research 152 (52%)
Contract Review/Drafting/Mgt. 133 (46%)
Intellectual Property 102 (35%)
Doc. Rev./E-Discovery/Lit. Support 103 (35%)
Immigration Services 41 (14%)
Secretarial Services 42 (14%)
Other Services 44 (15%)
I had not appreciated that legal research is still the top dog as far as LPO services go.