Outlook Calendar -- hosted IMAP, no ExchangeServer

Question

  What option do you recommend when using
  a hosted IMAP email service, but still
  want to allow the below #6 ?
---------------------------------------------
Summary

  I currently host Exchange 2007 in-house and want
  to move it to the cloud, but don't want to spend
  $4,000+/yr for 100 users on hosted ExchangeServer

  http://www.rackspace.com/email-hosting/webmail
  will work @ $2/user/mth, but does not provide
  the below #6 after I talked to RackSpace
  tech support.
---------------------------------------------
Possible Options
  ** https://www.officecalendar.com/purchase/purchase.aspx
       ** $70/user
  ** http://sharecalendar.4team.biz/Pricing.aspx
       ** $16/user
  ** http://www.codetwo.com/freeware/netcalendars/
       ** Free, does it work ?
  ** http://www.ehow.com/how_6783660_share-outlook-calendar-microsoft-exchange.html
       or http://www.msoutlook.info/question/686
       ** maybe ?
  ** https://www.3stepshare.com/purchase/purchase.aspx
       ** $24/user
  ** etc ?    
---------------------------------------------
Calendar Functions
 1. accept
 2. decline
 3. propose new time
 4. cancel meeting, send NOTICE to everyone so they can automatically remove from their "CALENDAR"
 5. reoccurring reminders, i.e. staff meeting at 9am every Monday, get popup Outlook reminder 15 minutes before
 6. show "FREE" time"
      ** open Outlook 2013
      ** open Calendar
      ** click "Scheduling Assistant"
      ** select the USERS you want
      ** everyone's "Schedule" appears
      ** pick a time everyone is FREE
---------------------------------------------
Multi-Client SYNC
 1. send email from iPhone or Android
 2. IMAP/etc email also appears in Outlook 2013
    desktop CLIENT's "Sent Items" instead of
    only on PHONE's "Sent Items"
finance_teacherAsked:
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Svet PaperovIT ManagerCommented:
Yes, it can be done for free (I had one such setup when we were using Linux-based mail).

You need to set up an anonymous FTP server and configure Outlook to publish and to look for free/busy information on it. This should help:

http://support.microsoft.com/kb/291621

http://client.creativeanswers.com.au/knowledgebase/50/How-to-configure-Microsoft-Outlook-Free-Busy-information-for-Calendar-availability.html

If all computers are domain members, if can even configure a GPO to push this Free/Busy information to the Outlook clients.
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