Do tax-liens get released on the associated years that are put in uncollectable status?

I guess it depends; Uncollectible status is NOT necessarily permanent; I mean ,the IRS may contact you ,typically every 2 years, to update your financial information and see if you are able to pay the tax or enter into an installment agreement. If your financial status has not improved such as to indicate a monthly payment ability you can remain in uncollectible status.