Moving from internal to hosted Exchange Server

I've run my own Exchange Server in house for about 7 years now, but due to the popularity of hosted Exchange, I'm toying with the idea of doing this myself. It seems like a great solution for disaster recovery, and would take away the sysadmin burden of running mail in house.

What I'm worried about here is performance. The users are happy with local Exchange, and so am I for that matter, but the bottom line is that I don't want to put something in place that doesn't give the users any advantages (from their point of view), and just ends up being the same solution, only slower. Obviously I would benefit from this move, but the users don't really care about that ;)

I know that cached Exchange does very well, but my users do a LOT of mailbox sharing (which I don't think is cached), I would imagine that pulling down large attachments is painful, and I've heard that the initial load of Outlook can sometimes be very slow during the opening synch.

Can anyone comment on this generally, or perhaps can someone who has gone through this conversion comment on their own experiences. I'm really on the fence here and not sure which direction to go.
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its dependant on how much internal resources you have and how advance you us your e-mail.
IF your bog standard e-mail user and do not have the resources to support it it could be a much better service. though if you are big businesss dealing with confidential information can you justfy taking it out of house.

i think internal skills, bandwith and money are the important factors. though worked for hosted exchanges we never had many faults and could provide top of the range equipment for fraction off the price.
jschwegAuthor Commented:
I'm not really concerned about the internal support as I've been handling it for years at this point. What I'm more concerned about is the user experience, ie performance differences when moving from internal to hosted. This project would be a complete failure if I decide to do this and the users have a worse user experience than they have now.
How many users.
Whats the speed off you internal link and your external link
jschwegAuthor Commented:
I have 40 users, 100Mb internal, 4.5Mb dedicated internet
n average sized email is usually less than 3 KB.

1) Normal email size, high volume
5000 a day * 30 days = 150,000 a month
150,000 * 3 KB = 0.429 GB of transfer a month

2) Large email size, high volume
5000 a day * 30 days = 150,000 a month
150,000 * 6 KB = 0.858 GB of transfer a month

3) Very large email size, moderate volume
1000 a day * 30 days = 30,000 a month
30,000 * 10 KB = 0.286 GB of transfer a month

 I guess you will be ok But i would dedicate half off it to  your hosted service. Also you will need a resilient link.

Waying up the cost i comes down to.

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