Maintain relationships for existing customers, develop potential market.

维护老客户关系，开发潜在市场；

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Milwaukee wants to raise water rates for existing customers to support its cash-strapped water supplier.

密尔沃基打算提高现有顾客的水费，以资助囊中羞涩的供水商。

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For existing customers, you get the chance to start those additional projects or add to the ongoing ones in a simplified and less expensive way.

对于现有的客户，您有机会以简单低价的方式启动这些额外项目或者在正在进行的项目中添加新特性。

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Many banks rushed to boost rates before limits on increases for existing customers took hold in February.

WSJ: Credit Cards Are Exception to Lower Consumer Rates

They see Microsoft doing the best it can for existing customers as they push their platform forward.

FORBES: What's The Story Behind Windows Phone 7.8?

He added that at least two other major lenders were looking at introducing something similar for existing customers.

BBC: Nationwide offers 125% mortgage