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POP3/SMTP? Best, Simple Exchange 2007/2010 Mail Failover Solution

Hello all experts,
Please can you give some advice on a solution for my clients Email functionality. We are in the process of installing a new exchange 2007 or 2010 server. They wish to have a back up solution of some kind in case they lose their mail server. (They did lose it for 2 days once and do not wish to go through this again.)

I spoke with their ISP who said that they can set up a ctach all, where all email will be held in the event of a loss of connection with the mail server. If my client chooses to make use of the cold back server option in their licensing we could redirect the mail here when the cold back server is online. However, the catch all has an internet portal where the mail can be viewed, but all the email will be lumped in together, so you will see everyones email if you access this way. There is an additional charge for this service.

When I spoke with their Domain host, he advised me that, if they change their mail delivery to POP3, everybody can have a logon to see their own mail on the internet portal and these accounts are free as part of the deal they already have in place. In the event of an exchange server failure, they can then log on to the internet and access their own individual mail. When the server is back up and running, mail will automatically be delivered to the exchnage server again.

I Know there are third party solutions to do this kind of thing, Postini, Mimecast etc but as a law firm, they want to keep as much control and ownership of their data as possible.

Can someone please tell me the the best way forward, the benefits and pitfalls of both POP3 or SMTP solutions please. Any advice is desperately welcomed.
Thank you,
1 Solution
If they want to keep control and ownership of their data, then using a pop3 service from the ISP is not the best solution.

They would be better off setting up a resiliant solution in house so that if a server failed, the seconday server would carry on providing email service.
SolpakTechnical DirectorAuthor Commented:
Thank you for your response, but, could you please elaborate on the differences, pro's/con's on POP3/SMTP/IMAP as a mail delivery solution? Some sites have already suggested POP3 being used in this environment as a cheap dr solution for small to medium sized business. This client has 75 users, and its own exchange server, NOT an SBS server, if user quantity makes any difference in this.
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