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J.R. SitmanFlag for United States of America

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Why SHOULDN'T we switch to Office 365 for E-mail only

I'm putting together the final stages of my Disaster Recovery Plan and one of my options is to move our e-mail from our internal Exchange 2010 server to the E1 Office 365 plan.  
My question is "is this really a good idea?"

With 365 e-mail do I get all the controls I have with my own Exchange server in house.
i.e. distribution lists, public calendars, forwarding email, granting other users permissions to a mailbox, limiting mailbox size, sending warnings when mailbox is reaching it's limits,  etc?

Point are high because I'm hoping for multiple opinions.
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Skyler Kincaid
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And how much faith you have in your ISP not to be down :)
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Don't know what SSO is, so I doubt we use it.  I'm sure I could learn Power Shell
We use Telepacific and have a T1 and MPLS both with automatic backup if one or the other fails.  So it's pretty reliable.
It is called Single Sign On:

http://technet.microsoft.com/en-us/library/hh852486.aspx

The technet article gives an overview. The idea is beneficial but implementation is the hard part.
If our e-mail is currently coming in to our Exchange server using bandwidth, would the mail coming and going from 365 use more or less bandwidth?
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This is all great information.

When our data is uploaded from our Exchange server to 365, will everything transfer as is.  i.e. public calendars, mailbox sub folders, etc.?
If the server was seized, couldn't Microsoft restore a backup of our data?
How long is email retained?  I have a retention policy setup to keep all received and sent e-mail for 90 days.  Can I still do that?
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Thanks for all the information.  I'll be splitting points today

@sembee2, do you know if Microsoft could restore our data in the event a server was seized?
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Thanks to all for the information