The splitting up of Microsoft could cost customers worldwide $6.8bn over 10 years as a result of price hikes for products from the two mini companies, according to researcher Aberdeen Group.
The analyst estimates that the total cost of separating the software giant would cost $43bn over 10 years and that the price of products would increase 10 per cent as a result.
Meanwhile, analysts at fellow research firm Gartner warned that as the remedies imposed by Judge Thomas Penfield Jackson on Wednesday are mostly aimed at the operating system company, the applications vendor could grow into another software giant.
This is particularly important as Microsoft prepares to push Next Generation Windows Services - its attempt to make Windows applications more suitable for the web. Also, it is possible that more middleware currently embedded in Windows will be unbundled and shifted to the applications company, said Gartner.
David Smith, Gartner vice president, said: "The case to date has been very focused on divestiture of Microsoft's platforms. Ironically, this may place a Microsoft applications company in a position that will be better prepared to innovate and acquire technologies."
Smith said that there has been almost no restrictions placed on the applications company, compared with those imposed on the operating systems business. These include the "timely" disclose of Windows application programming interfaces (APIs) to original equipment manufacturers and a ban on signing exclusive arrangements with such partners.
Analysts at the Aberdeen Group said the separation would mean consumers would have to pay more to ensure products from the two companies, as well as third-party vendors, work well together.
The $43bn includes legal costs and the effort required to restructure and rebrand the two companies and their product lines. Corporate buyers are also likely to have to shell out $20bn in increased system integration costs to tie together the separately designed products.
The costs would be absorbed by either the consumers or by reducing profits, said the Aberdeen Group.
"In addition to the hard costs, Microsoft's breakup creates enormous friction, delay, and uncertainty to the adoption of new information technology," said Peter Kastner, chief research officer at the Aberdeen Group.
"Without the inter-application integration that Microsoft has been providing, consumers and IS professionals will be faced with additional and costly burdens," he added.
The Aberdeen Group said the remedies should have ensured that Microsoft opens the Windows APIs to all developers on an equal footing, and that an independent panel be set up to police the company for five years.
On Wednesday, Judge Jackson ordered that Microsoft be split into a Windows company and another that produces applications such as word processing and spreadsheets.
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