What other products see when you merge or archive

A merge redirects every mirror; an archive hides the company everywhere.

Because Helpdesk and AMS mirror CRM's companies, merging or archiving a company in CRM changes what they see too.

Merging

The disappearing company becomes a redirect to the survivor. Every product that mirrors the customer follows the redirect, so tickets, assets and other work attached to the old record now point at the survivor.
"There is no undo. Nothing in the customer master reverses a merge, and every product that mirrors this customer will follow the redirect."
An old link to the merged company opens "This company was merged into another record" with Open the surviving account.
A draft quote on the merged company cannot be sent; delete it and create it again on the survivor. Tasks cannot be added to it either.

The company "stops being offered for new work and leaves the account list, in this product and in every product that mirrors the customer master."
Its contacts, its parent link and everything written against it stay exactly as they are.
Restore brings it back everywhere.

AMS can take back a company it created by mistake, if nothing else uses it. See Where a company came from.