Update dpending on combination of two columns

I have a table UserCompany:

A user can have serveral rows in the table, connected to several Companies.
I want to update the row with the min(CompanyID) and set defauly = true:

I can select the rows:

Select min(CompanyID) as comp,UserID
from UserCompany uc
where DefaultCompany <> 1
group by UserID

But can seem to figure out how to update the same rows?

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Guy Hengel [angelIII / a3]Billing EngineerCommented:
here we go:
   SET DefaultCompany = 1
FROM UserCompany uc
 WHERE uc.CompanyID = ( SELECT MIN(i.CompanyID)
                 FROM UserCompany i
                 WHERE i.UserID = uc.UserID

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stalebAuthor Commented:

I was so close, but still so far away
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Microsoft SQL Server 2005

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