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Does changing platforms erode your business for a while? (a live busniness case)


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I have watched with great interest as a flagship IBM outsourcing customer announced late last year it was moving away from Domino.  In the place of Domino is a whole slew of Microsoft products.  This company ran Lotus Notes for over eight years I believe before taking this plunge:

The rollout consists mainly of five Microsoft products-the Office 2003 desktop suite, Outlook E-mail client, Communicator instant-messaging software, Live Meeting conferencing service, and SharePoint document-sharing portal-plus Windows Server 2003 and other server software. The deal represents the largest license to date of Microsoft's real-time collaboration suite (Communicator 2005, Live Meeting 2005, and upgraded Live Communications Server 2005), introduced in March

I cannot see where the migration attempt for all these applications as well as the 20 terabytes of email.  Where the heck are they migrating that kind of data into Exchange?  How many servers is that going to be living in redundancy while the migration continues?  In the article the CIO notes that you cannot live in hybrid mode forever due to costs.  But no mention of the migration costs for 92,000+ PC's.  I guess there is no Linux clients anywhere :-)

So my question becomes, where does productivity, training, costs and manpower sit to run both at once, perform the migration and then support both systems?

The article mentions "pressing 8 years" for running Lotus Notes which leads me to believe customizations or slow upgrades.  How can a well embedded 8 year old system be harder to upgrade and maintain than an entire multi-product rollout banking on a version that was not even out yet?  I want to see some numbers here...