After 60 days you can read documents, spreadsheets, etc, but not make any changes. Much of the functionality of Office is disabled.
Uninstall should be available in the Control Panel > "Programs and Features" listing.
Sorry but I can't say about the two listings or Assemblies.
Mark
New computer has OS of Win 7 Pro.
Notice in the 'All Programs' bar under MS Office:-
MS Office 60 Day Trial Online
Access/Excel/PowerPoint/Outlook/Publisher/Word (all Office 2007)
Office Tools.
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What happens after 60 days? Assemblies
If I have to uninstall,
what exactly do I uninstall?
In Control Pnl/Uninstall its doesn't list
Word/Outlook/PowerPt etc it does list:-
MS Office Web Components 2003
MS " 2007 Primary Interop Assemblies
" " Sm Business Connectivity Components
" " Suite Activation Assistant
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And if you know - is there an advantage to MS
to make the two lists so very different (and confusing)?

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