I would be interested to see a reply to this thread, as yet there have been none. Any volunteers?
The primary issue involved in this case is the web messaging -- web messaging uses up much more CPU time and bandwidth than POP3/IMAP. I really don't know the capacity of web messaging.
The other issue is the amount of mail to be processed. For 125,000 users, that could be anywhere from several thousand E-mails/day to millions. A single server (even an old one) could easily thousands; a single server (high-end modern one) running IMail would have a very hard time handling 1,000,000+ E-mails/day.
So for an accurate answer, more information would be needed. A lot of IMail users have experience with large numbers of users and E-mails/day (we have customers processing 500,000+ E-mails/day on a single IMail server complete with virus and spam scanning), but there are fewer that have experience with very large volumes of web messaging traffic.
-Scott
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