Retaining Employees

While retaining employees should we collect the copy of offer letter issued by the new employer for filing purpose? Can this be made as HR policy in IT Company?

I too need the same clarification, can some one give in your thoughts

HR policy are generally what you set up, subject to not violating the local laws. And of course, follow some rules if natural justice, fairness and best practices.
A practice of keeping a copy of an offer letter against which you have made a counter offer does not violate any laws, is not unfair or run counter to any best practices. So I don't see any anyone should have an objection.....
On the other hand, it makes eminent sense to have a copy of an important document for future reference and for any HR audit you may be facing.
You need to ensure the document is confidential, with access restrictions and not misused

To collect offer letters supposedly issued by new employers to reduce attrition would serve no purpose and would be counter productive. Would the company consider to compensate the increase in that offer letter. Otherwise the employee would decline to give copy of offer letter. The employees would compete one another to produce such letters every month.
M Venkatraghavan