The MSN Money servers, supplying the stock/quote feeds, the MSN billing servers and Yodlee consolidation are monitored 24x7. When there is scheduled maintenance or unexpected downtime, MSN announce this to both their support teams and put the information online.
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Note that the weekly maintenance for MSN Money is at 1am Redmond time (PST or PDT) on Sunday morning, and could last up to 3 hours.
If you are using Money Plus, there is a link to the status page on the Tools menu:
This link may be present in some earlier versions of Microsoft Money too.
Keywords: Server, Status, Moneycentral, MSN