We have been using SalesForce.com for over 6 years.  We decided to move to Microsoft CRM Online 2011 recently but SalesForce.com makes it difficult for companies to switch providers.  Microsoft also does not provide good tools to make this migration possible.  The competition between them is just making it tough for companies to maintain control over the sales data.  I feel we should move to SugarCRM.  🙂