When trying to activate a sandboxed solution, Got below error message:
"The site collection containing this sandboxed solution has exceeded its daily resource usage quota."
This is because of the Sandbox solution resource limit. To fix this issue, just increase the site collection Sandbox solution resource quota in site collection quotas and locks.
Go to: Central Administration >> Application Management >> Configure quotas and locks >> Pick the target site collection.
In an another case, whey trying to deploy a sandbox solution from visual studio, it reported the same error "Error occurred in deployment step 'Add Solution': The site collection containing this sandboxed solution has exceeded its daily resource usage quota" and the fix is same!
Same thing applies to office 365! Set the "Resource Usage Quota" from SharePoint Online Administration Center Microsoft released a KB: http://support.microsoft.com/kb/2536051
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