Service tax

Dear Experts

In past F/Y our accounts consultants are not reveresed service tax inputs on services alike invoice from sequrity providers,rent of office & repair of machinery.Now i need to know that in this F/Y                                                                            can we avail inputs of all service tax which we recceived in this f/y or not. 

and are we have to intimate service tax department of this change.

thanks & regards

sanjay