Microsoft® Manual of Style, Fourth Edition

Prepositions

Do not make the word or phrase that you want to emphasize the object of a preposition. The object of the preposition is generally considered a weak position in a sentence. Readers pay more attention to the main sequence of subject–verb–object.

There is no rule against ending a sentence with a preposition. The preposition should go where it makes the sentence easiest to read. Like other editorial decisions, the placement of a preposition depends on the rhetorical situation.

Microsoft style

Type the text that you want to search for.

Type the text for which you want to search. (More formal, but also correct.)

Do not join more than two prepositional phrases unless you have no other choice. Long chains of prepositional phrases are difficult ...