>>If I understood you correctly now, you can create in your server a linked server to the one that has the correct data, then you can just use it in an update statement, something like
>>
>>

>>update yourDB.yourSchema.YourTable
>>set YourField = o.YourField from YourDB.YourSchema.YourTable m
>>join  [theOtherServer\theOtherInstance].YourDB.YourSchema.YourTable o on o.pk = m.pk
>>

>>
>>(Assuming the Schemas/Database also match, otherwise adjust as necessary.
>
>I created a linked server. I tested the connection and it works. But, when I type it in the query it does not want to recognize it. I mean the intellisense doesn't kick in. It's like there is something I need to put in front of the linked server name.
>
>In your example, what would be an example of theOtherServer and theOtherInstance?

CTRL+SHIFT+R will refresh the cache for intellisense, theOtherServer\theOtherInstance would be exactly what you have in your linked server, expand the "Linked Servers" item on object explorer and the name diplayed there is the one you need to type.

[Update]I did not mentioned it, but if you are using "theOtherServer\theOtherInstance" (ie with the backslash) then you must enclose it in square brackets as I put it in the original query