Remove Exchange 2010 Servers after 1+ years offline

I've been tasked with cleaning up an Exchange 2010 environment that has been offline for over a year. The client migrated email to Office 365 and shut down the old servers instead of decommissioning. Since AD has changed during that time I'm concerned about fallout.

Should I be worried about bringing those servers back online to decommission?
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David Johnson, CD, MVPOwnerCommented:
if the machines were physically turned off they are no longer part of the domain (well past the tombstone length) and you simply do a metadata cleanup with what's left.

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AmitIT ArchitectCommented:
Just use adsitedit tool to clean up the old server. Follow below articles.
btoewsAuthor Commented:
Thanks to both of you, appreciate it.
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