Hello. I am not sure why my colleague decided to get involved when I was already involved, but let me clarify some things for you. If it was a 2 year conditional green card that expired and you did not remove the conditions, then you are subject to deportation from the U.S. You would have to file an I-751 late, most likely in waiver form and explain why you filed late.
However, if you had a 10 year green card that expired, you are still a U.S. Lawful Permanent Resident even with an expired card. You are still in that status until an immigration judge determines that you are not. Obviously, with an expired card it makes it difficult to travel, work, and renew IDs such as drivers license, etc. So it is recommended that you file an I-90, but you aren't going to get deported if you do not file it.
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