En can replace de + phrase (adverbial pronoun)

Look at these sentences with the pronoun en:

Je viens de Paris. - J'en viens aussi !I come from Paris. - I come from there too!

Que penses-tu de cette exposition ? - J'en pense le plus grand bien !What do you think of this exhibition? - I think very highly of it.

Je m'occupe de mes problèmes. Je m'en occupe.I'm dealing with my problems. I'm dealing with them.
 -> Note that en can replace plural things too.

Elle a besoin de vacances. Elle en a besoin.She needs holidays. She needs them.
 

Notice that en as a pronoun can replace phrases introduced by the preposition de + [thing]/[object]/[location] (but not people), particularly with verbs that require de.  
In such cases, you cannot replace the noun alone with a pronoun, you must replace the whole de + [noun] group with en.

ATTENTION:

In the case of de + [people], the preposition de remains and is followed by a stress pronoun (moi, toi, lui, elle, nous, vous, eux, elles) replacing and agreeing with the noun:

Tu te moques de Paul et Daniel. - Non, je ne me moque pas d'eux !You're mocking Paul and Daniel. - No, I'm not mocking them!

J'ai besoin de ma mère tous les jours. - J'ai besoin d'elle aussi.I need my mother every day. - I need her too.

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Examples and resources

Elle a besoin de vacances. Elle en a besoin.She needs holidays. She needs them.
Que penses-tu de cette exposition ? - J'en pense le plus grand bien !What do you think of this exhibition? - I think very highly of it.
Je m'occupe de mes problèmes. Je m'en occupe.I'm dealing with my problems. I'm dealing with them.
Je viens de Paris. - J'en viens aussi !I come from Paris. - I come from there too!
J'ai des chocolats.  -  J'en ai.I've got chocolates.  -  I've got some.
Il se sert de ses outils. - Je m'en sers aussi.He's using his tools. - I'm using them too.
Tu joues de la trompette. -  Tu en joues.You play trumpet.  -  You play (it)
J'ai besoin de ma mère tous les jours. - J'ai besoin d'elle aussi.I need my mother every day. - I need her too.
Je mange de la purée.  -  J'en mange.I'm eating mash.  -   I'm eating some.
Tu te moques de Paul et Daniel. - Non, je ne me moque pas d'eux !You're mocking Paul and Daniel. - No, I'm not mocking them!
I'll be right with you...